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Offline dodger

  • Tommy Gunna

  • Joined: Dec 2009

  • Location: Melbourne
This was on the internet so it must be true -

Quote
Important. Please share!
Excellent Driving Tip:
A 36 year old female had an accident several weeks ago. It was raining, though not excessively when her car suddenly began to hydro-plane and literally flew through the air. She was not seriously injured but very stunned at the sudden occurrence! When she explained to the Police Officer what had happened, he told her something that every driver should know!
NEVER DRIVE IN THE RAIN WITH YOUR CRUISE CONTROL ON..
She thought she was being cautious by setting the cruise control and maintaining a safe consistent speed in the rain....
But the Police Officer told her that if the cruise control is on, your car will begin to hydro-plane when the tires lose contact with the road, and your car will accelerate to a higher rate of speed making you take off like an airplane. She told the Officer that was exactly what had occurred. The Officer said this warning should be listed, on the driver's seat sun-visor.
NEVER USE THE CRUISE CONTROL WHEN THE ROAD IS WET OR ICY,
Along with the airbag warning. We tell our teenagers to set the cruise control and drive a safe speed but we don't tell them to use the cruise control only when the road is dry.
The only person the accident victim found who knew this, (besides the Officer), was a man who'd had a similar accident, totaled his car and sustained severe injuries..
NOTE: Some vehicles (like the Toyota Sienna Limited XLE) will not allow you to set the cruise control when the windshield wipers are on.




Offline PA

  • One man comedy gala

  • Joined: Jan 2008

  • Location: www.club-carbon.com
If the speed sensor was on a non driving wheel it could but speed sensors are normally driven from the gearbox output shaft (or possibly a diff on a front wheel drive) so no it couldn't.

For the scenario your quote to occur the car would need to loose traction to the driving wheels then the non driving wheel speed sensor to tell the car to accelerate as it was now traveling slower than the set speed. The car would still not go faster than the set cruise speed.





Offline dodger

  • Tommy Gunna

  • Joined: Dec 2009

  • Location: Melbourne
Come to think of it even if the sensor wheel planned the cruise control would only take it back to the set speed anyway.



Offline bbb


  • Joined: Feb 2009

  • Location: Sydney


I like the "literally flew through the air" and Police officers "accelerate to a higher rate of speed making you take off like an airplane" comment, sounds accurate haha



Offline David B


  • Joined: Dec 2015

  • Location:
  • Drives:
Come to think of it even if the sensor wheel planned the cruise control would only take it back to the set speed anyway.

This article is wrong, and an urban myth.  Traction control always works by detecting slip, with a number of sensors detecting variation form wheel angle and vehicle trajectory.  But beyond that, a hydroplaning wheel is going to not spin less and activate a forward response from the cruise control, so the whole argument is bull.

Most likely she went around the corner at a constant speed that was to fast for the conditions and the vehicle lost traction...   All the helpful control systems a car has isnt going to break the laws of physics, but it probably brought her to a stop ( when she got around to applying the brakes) in the fast possible way given the conditions and mitigated her error as much as possible.

It always amazes me how the average person ( not the car buffs here) forget that the contact between car and road is only about 100 cm2 or the size of a mans hand per tyre.



Offline PA

  • One man comedy gala

  • Joined: Jan 2008

  • Location: www.club-carbon.com
Mondi says he has around 300 cm2, but that's another story.



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