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braking distance

A

AShadeOfClear

Banned
As I was doing some math homework, I read that braking distance for a car going 70mph on wet pavement is 428 feet. Does that sound right to you? I don't drive, but it sounds like a bit too much but then again 70 is pretty fast.
 
And that's before you consider whether you'll lose traction on the wet pavement, which depends on the condition of your tires.

Drive carefully. Newton was RIGHT! :Q
 
Try it sometime, at night, on the freeway, Go 70, then SLAM on your brakes(btw, dont blame me if you have drum breaks and you slide for 2000 feet after they heat up and stop working🙂
 
I've slammed my brakes numerous times from 60-70, once 80, down to 0.. all to make sure my rear disc swap worked well.. 😉 It hasn't rained here though, so I haven't been able to try it in the rain.. 😛
 
Depends on many factors, the biggest being the tires. Most compact cars will stop from 70 in around 200 ft on dry pavement, on wet 428 seems high. That's essentially equivalent to saying that the coefficient of friction between the tires & pavement is cut in half with the addition of water. I don't think that's right. Maybe by 25% on all-season tires... 250 ft?
 
they do tests for cars braking from 60mph I think. Modern sportcars would do around 120ft in ideal weather. and the record for a street legal car was around 94ft or so.

I watched a show on this on TLC about a year ago, so my memory maybe a little off.

anyway, if it's a crap car with crap brakes and crap tires, then 400+ft on wet weather wouldn't be surprising. But if you're using the latest and greatest of cars with the best brakes and rain race tires, you might end up just under 200ft 🙂
 
also depends on how "wet" the pavement. is it just damp (i.e. drying after a light rain), or is it soaked with pools of water everywhere?
 
Dry pavement including reaction time: "For example, at 70 mph, perception and reaction distance equals 154 feet, and braking distance equals 188 feet, for a total of 342 feet (5.2 seconds). "

Wet pavement including reaction time looks like about 428 ft for 70mph is about right on their graph.

All this here: Edmunds.com Braking distances .
 
I can tell you right now that my car in wet weather would take about 1500 feet to stop. The tires are crap.

rain definitely increases braking distance a lot. 150 feet or so is what a lot of cars get in dry weather stopping from 70...or is it 60 mph. Not sure. I wouldn't be surprised by a doubling of it in rain.
 
My cheap tires Kumsumho or Sumkumho or something (seriously) to that extent fish on dry pavement. When i drive my truck in the rain, i have to be especially careful b/c they LOVE to slide left and right when i tap on the brakes. They, however, make amazing burn outs and i can get them to smoke if i keep on it long enough.

-=bmacd=-
 
I beat a ticket for running a yellow light one time by quoting braking distances!!

According to the driving manual it took X amount of distance to stop a car going Y speed.

I was going about 25-30 and the light turned yellow while I was about 30 feet from it.

According to state law, you have to stop @ a yellow light unless it's unsafe to do otherwise.

@ the speed I was going, if I had tried to stop I would have been in the intersection by the time I stopped.

The judge tossed out the ticket!!

Averages are sometimes your friend!!! 😀

(X & Y are variables.....fill in the blank with the ACTUAL speed and distance !)

 
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