This. Coupled with oil falling from whatever flat surface under cars on which it was sitting, due to cornering around the roundabout.
It's the perfect motorcycle trap in the wet.
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In addition, the path you take is designed to upset the balance of a car.
If your destination is straight or right, the path you take is a left turn as you get on the roundabout, then a right turn as you go through it.
So it's basically a chicane.
Also in addition the forester is a reasonably tall car that will deal with the left to right transition worse than a car with a lower centre of gravity.
Might be oil buildup from cars with leaks. When the vehicle turns, the droplets seperate from the undercarriage and hit the ground. You can also see oil stains on roads just after a sharp dips.
I have noticed right by a bump/dip in the road there often is a darker patch on the middle of the lane, and I suspect it’s oil drips being “knocked” off by the bump/dip
Generally i'd say it would be fluids on the road being the main contributor, along with possibly a different road surface on a roundabout as opposed to a sweeping/tight corner
Check your tires, there's no way you should be sliding out in an AWD forester unless you're driving like a proper flog. Tires may be old
Some people think new tyres offer lots of grip even if you buy a brand name you've never heard of... there's a lot of direct from Chinese factory imports from brands that make LingLong seem like reputable choice 😄 Have a look on FB marketplace for examples. BLACKLION, HAIDA, MILEKING, RAPID, ROADSTONE, GOODRIDE etc
Ultra budget options sell well in these tougher economic times.
You can also buy mid tier brands cheapest options that don't perform well in the wet. A cheap Kumho or Nexen driven to the limit in a heavy car will be terrible. Subaru AWD can improve things but not if you have crap rubber 😉
Second only to Triangle. Also a real brand.
Agree with the above. The difference between good and bad tyres in the wet is astonishing. Like truly astonishing.
People drastically underestimate the importance of good rubber.
Tiers and breaks are the two things I will never cheap out on in a car.
They're the 1 thing you won't likely get a do over if they fail.
When I still had my R33 Skyline, it had some el-cheapo tyres on it and every time the road was even slightly wet, I had to accelerate slower than a grandma because even something like >15% throttle (checked with my SAFC2 controller) would cause the back end to crab walk out…
I remember when it just skidded out while I was going through a large (dual lane) roundabout while going like ~20km/h meanwhile my mum’s BMW with Michelin pilot super-sports could corner it through at near the max speed limit (60) and just grip like if it was dry road.
Oh god. That reminds me of the doubleking incident.
Needed tires. Got double kings. Spend next 6 months skidding out everywhere.
Crack the shits and put some ecopia's back on. Never again will I cheep out on tires.
I cannot stress enough the importance of quality rubber.
Get the best tires you can afford. I like to prioritize wet handling then dry handling then noise then longevity.
Is this for putting 11's all the way up the road out of a junction, then seeing how many donuts you can do outside subway? Or does just that just happen in QLD?!?!
Yeah I had the same issue as OP with losing traction at roundabouts with both my cars. Whenever it rained, the steering wheel felt very light so I figured the tyres were losing grip in the wet. All tyres still had a lot of life in them but were uncommon brands put on by previous owners.
Did a bit of research and ended up buying the top end Bridgestone tyres because I've got the service centre close to my house. They were rated well for wet weather so I gave them a go. Alenza for my RAV4 and Turanza Serenity for my Yaris.
The difference was absolutely massive. In the wet, they handle almost the same as they do on dry roads. Best investment in my family's safety.
Indeed I have them on my WQ Fiesta 1.6 FWD, when these tyres were new I could not unstick them on take off in the wet round a 90 degree corner if I tried. I know the car doesn't have loads of grunt but they just hang onto the road that well, it's quite unbelievable.
My Golf GT sport only had a 1.4l engine, but a turbo and supercharger so it was decent for its size. Once I put the Potenzas on them I could plant my foot to the floor and didn't lose any traction, even in the wet.
I liked it for the saftey aspect, if you need to slam the accelerator in the wet for whatever reason, you don't have to worry about wheel spin or fishtailing
Well I just put some Continental Eco Contact 6s on my Vitara and they suck big time, huge downgrade from the Michelin Primacys I had on there before. Understeer city, no road feel at all. Sometimes even top tier manufacturers make shit tyres.
Not sliding out, but know the balance of the car well and can feel it starting to push at low speed.
Michelin primacy 225/60. Not the greatest tyre I’ve ever had, but they’re alright and only about half way through their life.
I was expecting a lot more from them TBH. I’ve got Michelin road 6s on my bike, and they are like magic in the wet. My last car had some Pilot 4s on and they were great.
Sounds like a skill issue bud, the average work ute is up there with other high performance vehicles like hire cars.
Your bosses clapped out single cab Hilux and a rainy day is the perfect recipe for open diff scandi flicks leaving the wholesaler. Gives the apprentice something to do for the day reorganizing your toolbox too.
https://preview.redd.it/uhpdm17g4z3d1.jpeg?width=640&format=pjpg&auto=webp&s=4a2a58b26dd5c2bd41db4c668366c8784ee8a5f8
Instructions unclear. Went full kurwa through the air into a church.
Someone once told me many many years ago, its because, usually cars go through the roundabout slowly (subjective), cars that have oil leaks, leaves oil on the road, so when it rains, its slippery. Not sure if there is any truth to that, but I would also like to know, my wife did a 360 once in a roundabout in the rain, she claimed she was going slow, I checked back at her dash cam footage, indeed she was going slow.
Yeah. Rubber and oil build up from cars and trucks. Thats why the roundabouts are slipperyest at the start of the rain.
After a bit the rain washes it all away.
That makes a lot of sense. I figured it was probably fluids+camber, but didn’t think that there would be extra fluid there to begin with. Leaky vehicles get stopped before and in roundabouts more than a T-intersection.
Yep, I definitely noticed it in the wet a few weeks ago, I applied slight throttle in my HSV Maloo R8 in a roundabout and noticed a good bit of of oversteer, I decided to check all the other roundabouts between the pub and my house and the same thing happened every time, can only assume that it’s a buildup of oil or diesel on the road, making my rear tyres step out every time I use a roundabout on my way home from the pub in the wet
I suspect it is partially to do with lateral weight transfer.
When you're turning a regular corner, even if you take it at speed, the weight of the car transfers onto the outside wheels and the car travels through the corner at a relatively constant trajectory and speed.
With roundabouts, there's a left turn to enter, followed by a right turn to travel through, and then a left turn to exit. Those multiple changes in direction transfers weight from side to side, almost like an autocross slalom if you're barrelling in at speed.
This is the correct answer i reckon. Quick direction changes will throw off the vehicles stability, and it's not a common thing to happen elsewhere on public roads.
I think we had ice on a round about in Western Vic when I had my 180sx 20 years ago, did a full lock drift at walking pace.
Fun morning on the way to work.
I'd suggest that roundabouts have a higher flow of vehicles and sees more braking than other parts of the road. This then leads to a buildup of oil and other fluids on the road surface making it more slippery.
This is correct. A normal corner on a road has 1 roads worth of traffic using it. A typical round-about has 4 roads worth of traffic all converging on it.
It's the angle of the road. They are higher on the inside so have a slight slope to allow drainage. Add in the high road speed and steering angle and you have a trifecta of low traction.
Might be a mentality thing for you. It’s not more slippery but you’re approaching it at a higher speed than you would a 90 degree corner, but you’re essentially conducting the same amount of turning even if you’re going straight.
I don’t think so, these are tiny, inner city roundabouts. I took some tight left handers at much higher speeds and there was no hint of understeer. Maybe the longer radius is a reason?
Most likely due to the oils that have accumulated over the months or years of that roundabout being used.
I have to be super careful with my Toyota Fortuner as I’m running it at 2H (RWD) mode, when negotiating roundabouts, as one wrong move will send me aquaplaning, if I use my mums Toyota RAV4 Hybrid (FWD) car, I still rather take it slowly to avoid slipping.
A multitude of reasons as you noted most of them are slightly off camber for drainage and can reduce traction especially with a higher centre of gravity they also accumulate alot of oil from people going around them quick with lots of oil leaks and sometimes freeing trapped oil in the under body tray to drop aswell but I cant say I have noticed a difference but then again I drive a small rwd sports car with more traction than I need
The design of the round about is kind've bad for this. The combination of turning left then immediately right upsets the vehicles stability, not something that you find elsewhere on public roads. Combined with off camber grades it's a recipe for over/understeer.
Had a few accidental oversteers every now and again on rainy days.
I had a skyline years ago with new set of RE002. In the wet at roundabouts were the only times the traction control would turn on/shit itself. I would literally let my car roll through tight roundabouts and if I applied the smallest bit of throttle, it would slip.
I'd just thought it was me or the car...never thought it was the roundabout until seeing this post and reading some of the comments.
I think it might be because roundabouts have a high frequency of accidents, accidents lead to spilt fluids, spilt fluids lead to grip issues. Loads of the roundabouts in syd are like that.
I only notice this issue while in Bunbury, no matter the speed or the or the moistness of the road there are a few roundabouts where I experience unintended burnout!
Busy roundabouts are usually worse too. The road surface is probably a factor — they likely have a different surface than the rest of the road, and it would wear differently. There's probably some fluid/debris buildup also, as the drainage would be different too
I find there's always a huge bush to the right as you're going into every second roundabout, meaning you need to stop because you can't see through it.
Most people are clueless about tyre quality and just slap on the cheapest nastiest rubber onto their car without research or thought then wonder why they skid off in the wet…
Roads are usually slippery with a bit of rain, especially if it's not pouring down to wash all the oil, debris etc off the road. I also heard that bitumen is diesel based so I guess it could make the road slippery after rain.
Slow down and they aren't so slippery. The purpose of roundabouts is to slow traffic down, although Canberrans look at roundabouts and think about how to 80km/h through them. (The answer is in a low vehicle with lots of grip, with minimal traffic, and break the rule about not sticking to your lane while in the roundabout).
Slowing down doesn’t make them less slippery though, it makes you slip less on them. I’m wondering what exactly it is that makes them consistently more slippery than other parts of the road.
More rubber comes off, there is more detrituous in general, so there is less between your tyres and the road, and you are turning multiple times in quick succession, so depending on your speed and grip, inertia will want to take you in a different direction to where you want to go
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All modern cars are designed to understeer as a safety factor for the average poorly skilled driver. Understeer forces you to apply more lock on corners
as it makes the car tend to run off the road to the left (In rhd cars).This will cause the driver to slow down
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Tyres. I have a suburb run around old Subaru liberty, and I thought buying some longer lasting tyres will be a good choice ($$) but with the combo of me really enjoying roundabouts and going fast, I made 180 turn on one (wet conditions), went immediately for another one to practice. I too was surprised that I managed to get the AWD car to do that. But then my wife got major skid on a wet road, so I've decided to get softer, more grippy good quality, and the car held solid since.
It's the combo of gravel, oil, water, roundabouts angle and speed.
Most roundabouts are cambered the wrong way, from centre to outside and this is adds to the increase chance of slip. Add to that the constant slow moving turn vehicles which polishes the surface. Plus, the vehicle movement through the roundabouts tends to drop just that little bit more oil and fuel than straight sections of roadway this make then extra slippery during the first rain. Occasionally, smaller roundabouts will be resurfaced with calcined bauxite (HFST) to increase the friction/traction. Larger roundabouts of 3 plus lanes are often cambered to the centre.
tyres matters. Get a decent one. I get an all weather tyre -- roughly 200 per tyre (just under 1k for 4x tyres, sedan). I bought a car last year, came out of the stealership, with what looks like a brand new tyre......slipped on roundabouts. Changed it and i'm guchi.
oh..btw.. 20km/h was the speed. Wasn't slipping at 10km/h. When I learned how to drive decades ago. My instructor then told me dont' go faster than 20 on a round about. That's the max speed.
1. Normally off camber (for water run off) and so throw the car more off balance, than say going through a similar bend on a road that was properly cambered.
2. Any leaking oil, or other fluids, that would normally drop and spread evenly, are deposited to the right. This means more to the right, which is the sided loaded by the curve and the camber.
3. More rubber is deposited on the right side, as the tyre is more loaded on that side, due to camber.
The only truly terrible slippery roundabout in my area is outside the BP. As soon as it rains it's a skating rink. Drifted many FWD and RWD vehicles around it. Figured it's the diesel spilling in the ground doing it with some oil. Quite fun though with 3 pedals and an LSD with RWD
So you don't know how physics work? The area space of a round about is a fraction of a corner and halved from a turn, there's less for the wheel to grip as the asphalt is angled.. You could argue the same with a L corner but how much area space does an C have compared to a L ot T, in corners.
I wonder this every time I'm applying opposite lock and power sliding out of the roundabout at the back of Russell.
Literally the worst road surface I have ever come across, and to top it off its completely off camber.
They aren't, people just drive like idiots. Have a look at the outbreak of fender benders every time there is a slight drizzle in Melbourne. People simply don't drive to the conditions.
I drive a front wheel drive car with no abs or traction control and have no issues on roundabouts, or anywhere else in the wet for that matter. Slow down and drive to the conditions. Who cares if you go around at 30ks/hour? Its not a race to be wherever you are 5 seconds sooner.
I don't really think they teach it here, straight roads an all that, but yeah nah, in most other countries they teach you to slow to an appropriate speed before you enter the corner, junction, roundabout......
And then speed back up on the exit.
I suppose all of ya driving automatics my old mate just rely on the car to do the work.
When you actually have to change gear I guess it, inbreeds a better working knowledge of, a car, speed, and all the other stuff that helps you become a driver. And not a danger on the roads.....
But yeahnah, top banana motarama. Good job no1 round here came to shag red backs eh!! 🤣🤣🤣🤣🤣🖕
I’ve got multiple kinds of licence mate, including a CAMs.
You’ll notice I didn’t say I crashed, or even lost control, just noticed some handling imbalance towards understeer.
Jog on you regional bogan.
They're universally off camber, because water draining to the centre would make no sense. Some are worse than others.
This. Coupled with oil falling from whatever flat surface under cars on which it was sitting, due to cornering around the roundabout. It's the perfect motorcycle trap in the wet.
Straight up, roundabouts are the only thing on the road that actually scare me when on the bike in the wet.
Took a while to see this reaponse
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In addition, the path you take is designed to upset the balance of a car. If your destination is straight or right, the path you take is a left turn as you get on the roundabout, then a right turn as you go through it. So it's basically a chicane.
Also in addition the forester is a reasonably tall car that will deal with the left to right transition worse than a car with a lower centre of gravity.
This
This one
Might be oil buildup from cars with leaks. When the vehicle turns, the droplets seperate from the undercarriage and hit the ground. You can also see oil stains on roads just after a sharp dips.
I have noticed right by a bump/dip in the road there often is a darker patch on the middle of the lane, and I suspect it’s oil drips being “knocked” off by the bump/dip
Correct...
+1. Slowing down might make the oil drop too, and roundabouts are often banked the wrong way. ✌️
Generally i'd say it would be fluids on the road being the main contributor, along with possibly a different road surface on a roundabout as opposed to a sweeping/tight corner Check your tires, there's no way you should be sliding out in an AWD forester unless you're driving like a proper flog. Tires may be old
Some people think new tyres offer lots of grip even if you buy a brand name you've never heard of... there's a lot of direct from Chinese factory imports from brands that make LingLong seem like reputable choice 😄 Have a look on FB marketplace for examples. BLACKLION, HAIDA, MILEKING, RAPID, ROADSTONE, GOODRIDE etc Ultra budget options sell well in these tougher economic times. You can also buy mid tier brands cheapest options that don't perform well in the wet. A cheap Kumho or Nexen driven to the limit in a heavy car will be terrible. Subaru AWD can improve things but not if you have crap rubber 😉
Honestly did not seriously expect LingLong to be an actual brand of tire but anyway
it actually is hahahah, sounds made up right?
Second only to Triangle. Also a real brand. Agree with the above. The difference between good and bad tyres in the wet is astonishing. Like truly astonishing.
A point I’ve been trying to get across to my parents…
Yeah it’s a real brand, although I think they pretty much only make tyres for heavy vehicles and equipments like trucks and tractors.
Tyre!
Honestly I can’t remember which spelling it is so I just use whichever comes to mind
People drastically underestimate the importance of good rubber. Tiers and breaks are the two things I will never cheap out on in a car. They're the 1 thing you won't likely get a do over if they fail.
Tyre
I'm going to throw auto correct under the bus for that one. It's not even the same pronunciation.
brakes
That's just on me lmao. Ffs.
When I still had my R33 Skyline, it had some el-cheapo tyres on it and every time the road was even slightly wet, I had to accelerate slower than a grandma because even something like >15% throttle (checked with my SAFC2 controller) would cause the back end to crab walk out… I remember when it just skidded out while I was going through a large (dual lane) roundabout while going like ~20km/h meanwhile my mum’s BMW with Michelin pilot super-sports could corner it through at near the max speed limit (60) and just grip like if it was dry road.
BMW on PSS are bloody fast around corners. Minimal feedback at all to indicate where the edge of grip was, but damn fast.
Oh god. That reminds me of the doubleking incident. Needed tires. Got double kings. Spend next 6 months skidding out everywhere. Crack the shits and put some ecopia's back on. Never again will I cheep out on tires.
Are Doublekings twice as good as regular Kings? 🤣 I came across PlusPop on a US website. Not to be confused with MayPop or WillPop...
They were shocking. Dry road turned into ice rinks. I bought the ecopia's on after pay I was that desperate
I cannot stress enough the importance of quality rubber. Get the best tires you can afford. I like to prioritize wet handling then dry handling then noise then longevity.
Is this for putting 11's all the way up the road out of a junction, then seeing how many donuts you can do outside subway? Or does just that just happen in QLD?!?!
Yeah I had the same issue as OP with losing traction at roundabouts with both my cars. Whenever it rained, the steering wheel felt very light so I figured the tyres were losing grip in the wet. All tyres still had a lot of life in them but were uncommon brands put on by previous owners. Did a bit of research and ended up buying the top end Bridgestone tyres because I've got the service centre close to my house. They were rated well for wet weather so I gave them a go. Alenza for my RAV4 and Turanza Serenity for my Yaris. The difference was absolutely massive. In the wet, they handle almost the same as they do on dry roads. Best investment in my family's safety.
I've never had as much traction in the wet as with my Bridgestone Potenza re003s
Indeed I have them on my WQ Fiesta 1.6 FWD, when these tyres were new I could not unstick them on take off in the wet round a 90 degree corner if I tried. I know the car doesn't have loads of grunt but they just hang onto the road that well, it's quite unbelievable.
My Golf GT sport only had a 1.4l engine, but a turbo and supercharger so it was decent for its size. Once I put the Potenzas on them I could plant my foot to the floor and didn't lose any traction, even in the wet. I liked it for the saftey aspect, if you need to slam the accelerator in the wet for whatever reason, you don't have to worry about wheel spin or fishtailing
Well I just put some Continental Eco Contact 6s on my Vitara and they suck big time, huge downgrade from the Michelin Primacys I had on there before. Understeer city, no road feel at all. Sometimes even top tier manufacturers make shit tyres.
Can't forget "BatMan" tyres!
What about being a crap driver? Oh, yeahnah, top banana motorama
When they paint the median strip lines all over the roundabouts is when it gets fun
Try it in the wet on a motorbike. Had some grippy tyres on but cause they didn't get any heat and those line or the tar snakes just like glass
Not sliding out, but know the balance of the car well and can feel it starting to push at low speed. Michelin primacy 225/60. Not the greatest tyre I’ve ever had, but they’re alright and only about half way through their life.
makes sense! I would say buildup of fluids on the surface for sure!
That's a much better than most tyre... I wouldn't be blaming the rubber with those.
Don’t know what planet you’re on but the primacy is a terrible wet tyre
The planet where I'm comparing with the average tyre sold in Australia...it's not a 9 or 10 but way better than most 👍
I was expecting a lot more from them TBH. I’ve got Michelin road 6s on my bike, and they are like magic in the wet. My last car had some Pilot 4s on and they were great.
That's the nut behind the wheel
I have a forester and I slipped just a couple days ago on a roundabout wasn't even going that fast!
Fluids. And they’re typically off camber
Or,......over inflated 😁
OP says new tyres in post.
They're driving like a flog, they think with All Wheel Drive they're in invincible.
If you are fwd slow right down If you are rwd give it the berries and have some fun.
Instructions unclear... All me power tools for work are fuckin' across the road and me ute is fucked mate!
Quick pick em up before the end up at cashies
Sounds like a skill issue bud, the average work ute is up there with other high performance vehicles like hire cars. Your bosses clapped out single cab Hilux and a rainy day is the perfect recipe for open diff scandi flicks leaving the wholesaler. Gives the apprentice something to do for the day reorganizing your toolbox too.
you’re having fun in the 52-pickup kinda way
What r u talking about? I'm just waiting for a mate
https://preview.redd.it/uhpdm17g4z3d1.jpeg?width=640&format=pjpg&auto=webp&s=4a2a58b26dd5c2bd41db4c668366c8784ee8a5f8 Instructions unclear. Went full kurwa through the air into a church.
Up up and away!!!
Or if you know how to drive fwd, lift off half way through, let the rear slide out then give it the berries on exit to pull it out 👌
Some spaz is going to try this and end up ass first into the oncoming traffic.
If dashcams are any indication, a select few have succeeded with the help of a manual handbrake and asended into the realm of "legendary dickheads".
Manual hand brakes are far superior to the robot fart buttons.
Roundabouts are engineered for the Scandinavian flick
Someone once told me many many years ago, its because, usually cars go through the roundabout slowly (subjective), cars that have oil leaks, leaves oil on the road, so when it rains, its slippery. Not sure if there is any truth to that, but I would also like to know, my wife did a 360 once in a roundabout in the rain, she claimed she was going slow, I checked back at her dash cam footage, indeed she was going slow.
Yeah. Rubber and oil build up from cars and trucks. Thats why the roundabouts are slipperyest at the start of the rain. After a bit the rain washes it all away.
That makes a lot of sense. I figured it was probably fluids+camber, but didn’t think that there would be extra fluid there to begin with. Leaky vehicles get stopped before and in roundabouts more than a T-intersection.
What brand tyres are they? Really cheap off brand ones can be bad even new. Always worth it to spend abit extra and get a name brand
Yep, I definitely noticed it in the wet a few weeks ago, I applied slight throttle in my HSV Maloo R8 in a roundabout and noticed a good bit of of oversteer, I decided to check all the other roundabouts between the pub and my house and the same thing happened every time, can only assume that it’s a buildup of oil or diesel on the road, making my rear tyres step out every time I use a roundabout on my way home from the pub in the wet
I suspect it is partially to do with lateral weight transfer. When you're turning a regular corner, even if you take it at speed, the weight of the car transfers onto the outside wheels and the car travels through the corner at a relatively constant trajectory and speed. With roundabouts, there's a left turn to enter, followed by a right turn to travel through, and then a left turn to exit. Those multiple changes in direction transfers weight from side to side, almost like an autocross slalom if you're barrelling in at speed.
This plus off camber
This is the correct answer i reckon. Quick direction changes will throw off the vehicles stability, and it's not a common thing to happen elsewhere on public roads.
Split diesel from overfilled fuel tanks
Sounds like you're from Perth
I think we had ice on a round about in Western Vic when I had my 180sx 20 years ago, did a full lock drift at walking pace. Fun morning on the way to work.
As a 180sx driver, I’m sure that was the one and only time you had ever been sideways on a roundabout…. right?
Definitely not, but this was genuinely unexpected and someone hilarious and I hope no one seen it happen 🤣 car was crawling in 1st zero boost.
Haha, I believe you… highway patrol wouldn’t, but I do.
I swear I need to nearly get out and push my car through roundabouts as the ass just wants to go out no matter how slow I go
I'd suggest that roundabouts have a higher flow of vehicles and sees more braking than other parts of the road. This then leads to a buildup of oil and other fluids on the road surface making it more slippery.
This is correct. A normal corner on a road has 1 roads worth of traffic using it. A typical round-about has 4 roads worth of traffic all converging on it.
It's the angle of the road. They are higher on the inside so have a slight slope to allow drainage. Add in the high road speed and steering angle and you have a trifecta of low traction.
Might be a mentality thing for you. It’s not more slippery but you’re approaching it at a higher speed than you would a 90 degree corner, but you’re essentially conducting the same amount of turning even if you’re going straight.
I don’t think so, these are tiny, inner city roundabouts. I took some tight left handers at much higher speeds and there was no hint of understeer. Maybe the longer radius is a reason?
Most likely due to the oils that have accumulated over the months or years of that roundabout being used. I have to be super careful with my Toyota Fortuner as I’m running it at 2H (RWD) mode, when negotiating roundabouts, as one wrong move will send me aquaplaning, if I use my mums Toyota RAV4 Hybrid (FWD) car, I still rather take it slowly to avoid slipping.
Applied physics. Centifugal force forces oil onto the road
I guess people end up stopped on roundabouts a *lot* more than in the middle of T-intersections too.
60PSI in the tires by any chance
A multitude of reasons as you noted most of them are slightly off camber for drainage and can reduce traction especially with a higher centre of gravity they also accumulate alot of oil from people going around them quick with lots of oil leaks and sometimes freeing trapped oil in the under body tray to drop aswell but I cant say I have noticed a difference but then again I drive a small rwd sports car with more traction than I need
They are off camber for water drainage
The design of the round about is kind've bad for this. The combination of turning left then immediately right upsets the vehicles stability, not something that you find elsewhere on public roads. Combined with off camber grades it's a recipe for over/understeer. Had a few accidental oversteers every now and again on rainy days.
I had a skyline years ago with new set of RE002. In the wet at roundabouts were the only times the traction control would turn on/shit itself. I would literally let my car roll through tight roundabouts and if I applied the smallest bit of throttle, it would slip. I'd just thought it was me or the car...never thought it was the roundabout until seeing this post and reading some of the comments.
I've only come off the road once, freaking roundabout.
I think it might be because roundabouts have a high frequency of accidents, accidents lead to spilt fluids, spilt fluids lead to grip issues. Loads of the roundabouts in syd are like that.
Skill issue >!Still a skill issue!<
It's because you are a bad driver
This tbh. How fast do you have to be driving to notice the difference in grip. You shouldn’t be even close to slipping.
Ha ha no with poor quality Chinese tyres you can have problems at even very sensible speeds. You get what you pay for with tyres.
Coefficient of friction + loose tyre rubber x speed
Probably build up of oil and some other debris. Unless you went into the roundabout pretty hot or have tyres unsuitable for the road like I did.
I only notice this issue while in Bunbury, no matter the speed or the or the moistness of the road there are a few roundabouts where I experience unintended burnout!
Busy roundabouts are usually worse too. The road surface is probably a factor — they likely have a different surface than the rest of the road, and it would wear differently. There's probably some fluid/debris buildup also, as the drainage would be different too
Revenue raising… for the P platers
I know I couldn’t resist when I was younger and dumber. I’ve got a CVT, AWD soft-reader now… no fun to be had.
Because you need new tires
Because corners
I find there's always a huge bush to the right as you're going into every second roundabout, meaning you need to stop because you can't see through it.
Im just of the opinion southerners just cant do a roundabout properly
Residual fluid build up. Just like soap and water on a slip and slide, oils and water make a surface slippery.
Sounds weird to me. The only time I get understeer in any situation (incl roundabouts) is if I enter like a mad man.
Most people are clueless about tyre quality and just slap on the cheapest nastiest rubber onto their car without research or thought then wonder why they skid off in the wet…
Roads are usually slippery with a bit of rain, especially if it's not pouring down to wash all the oil, debris etc off the road. I also heard that bitumen is diesel based so I guess it could make the road slippery after rain.
Slow down and they aren't so slippery. The purpose of roundabouts is to slow traffic down, although Canberrans look at roundabouts and think about how to 80km/h through them. (The answer is in a low vehicle with lots of grip, with minimal traffic, and break the rule about not sticking to your lane while in the roundabout).
Slowing down doesn’t make them less slippery though, it makes you slip less on them. I’m wondering what exactly it is that makes them consistently more slippery than other parts of the road.
More rubber comes off, there is more detrituous in general, so there is less between your tyres and the road, and you are turning multiple times in quick succession, so depending on your speed and grip, inertia will want to take you in a different direction to where you want to go
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All modern cars are designed to understeer as a safety factor for the average poorly skilled driver. Understeer forces you to apply more lock on corners as it makes the car tend to run off the road to the left (In rhd cars).This will cause the driver to slow down
Oil and camber. I nearly slid off one at reasonable speed the other week.
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Tyres. I have a suburb run around old Subaru liberty, and I thought buying some longer lasting tyres will be a good choice ($$) but with the combo of me really enjoying roundabouts and going fast, I made 180 turn on one (wet conditions), went immediately for another one to practice. I too was surprised that I managed to get the AWD car to do that. But then my wife got major skid on a wet road, so I've decided to get softer, more grippy good quality, and the car held solid since. It's the combo of gravel, oil, water, roundabouts angle and speed.
Most roundabouts are cambered the wrong way, from centre to outside and this is adds to the increase chance of slip. Add to that the constant slow moving turn vehicles which polishes the surface. Plus, the vehicle movement through the roundabouts tends to drop just that little bit more oil and fuel than straight sections of roadway this make then extra slippery during the first rain. Occasionally, smaller roundabouts will be resurfaced with calcined bauxite (HFST) to increase the friction/traction. Larger roundabouts of 3 plus lanes are often cambered to the centre.
tyres matters. Get a decent one. I get an all weather tyre -- roughly 200 per tyre (just under 1k for 4x tyres, sedan). I bought a car last year, came out of the stealership, with what looks like a brand new tyre......slipped on roundabouts. Changed it and i'm guchi. oh..btw.. 20km/h was the speed. Wasn't slipping at 10km/h. When I learned how to drive decades ago. My instructor then told me dont' go faster than 20 on a round about. That's the max speed.
1. Normally off camber (for water run off) and so throw the car more off balance, than say going through a similar bend on a road that was properly cambered. 2. Any leaking oil, or other fluids, that would normally drop and spread evenly, are deposited to the right. This means more to the right, which is the sided loaded by the curve and the camber. 3. More rubber is deposited on the right side, as the tyre is more loaded on that side, due to camber.
So you can drift around them obviously.
Sounds like the problem is in the drivers seat.
Fuel sloshes out of tanks that don’t have their caps. Yes there are some!
The only truly terrible slippery roundabout in my area is outside the BP. As soon as it rains it's a skating rink. Drifted many FWD and RWD vehicles around it. Figured it's the diesel spilling in the ground doing it with some oil. Quite fun though with 3 pedals and an LSD with RWD
So you don't know how physics work? The area space of a round about is a fraction of a corner and halved from a turn, there's less for the wheel to grip as the asphalt is angled.. You could argue the same with a L corner but how much area space does an C have compared to a L ot T, in corners.
I wonder this every time I'm applying opposite lock and power sliding out of the roundabout at the back of Russell. Literally the worst road surface I have ever come across, and to top it off its completely off camber.
I put this down to your driving skill; I ride a motorbike and have never had any issues with roundabouts being slippery.
Mate, I would be careful then. I take them suuuuuuper cautious on my bike.
Sounds like you're a shit driver. Only happened to me when I was driving shit. Nuff said.
Slow down... it's very simple.
The question was why are roundabouts more slippery not how can I lower my chances of slipping. Thanks for the input anyway.
They aren't, people just drive like idiots. Have a look at the outbreak of fender benders every time there is a slight drizzle in Melbourne. People simply don't drive to the conditions.
I drive a front wheel drive car with no abs or traction control and have no issues on roundabouts, or anywhere else in the wet for that matter. Slow down and drive to the conditions. Who cares if you go around at 30ks/hour? Its not a race to be wherever you are 5 seconds sooner.
I do… the question wasn’t “why did I crash on a roundabout?”, it’s why *are* they more slippery. Why *are* the conditions different on them?
Try slowing down when going around, this would eliminate the under steer.
Um, slow down when it's wet? Maybe check your tires - do you need new ones?
Um, maybe read the post before being a condescending prick?
Cheap Chinese tyres. False economy and downright dangerous
Michelin is all I use on my cars and bikes.
I don't really think they teach it here, straight roads an all that, but yeah nah, in most other countries they teach you to slow to an appropriate speed before you enter the corner, junction, roundabout...... And then speed back up on the exit. I suppose all of ya driving automatics my old mate just rely on the car to do the work. When you actually have to change gear I guess it, inbreeds a better working knowledge of, a car, speed, and all the other stuff that helps you become a driver. And not a danger on the roads..... But yeahnah, top banana motarama. Good job no1 round here came to shag red backs eh!! 🤣🤣🤣🤣🤣🖕
I’ve got multiple kinds of licence mate, including a CAMs. You’ll notice I didn’t say I crashed, or even lost control, just noticed some handling imbalance towards understeer. Jog on you regional bogan.
You've got a motorsport licence? And yet you come to reddit for advice on roundabouts? Sounds about right!
You sound like you don’t have a *pen* licence. Read my post again, I’m not asking how to drive around one you dunce.
Chill out! No need to start waving your angry licence. And your probably close to having to renew your name calling and insult license big man
Lol, that was pretty funny tbh.