Cruise Control, Do Not On When Driving In The Rain

rodders

Well-Known Member
Legendary 10 Years
PLEASE READ IT COULD SAVE YOUR LIFE

I wonder how many people know about this………………?

A 36-year-old female had an accident several
weeks ago and totally written off her car. A resident of Wollongong,
NSW, she was travelling between Wollongong & Sydney. It was raining,
though not speeding excessively, when her car suddenly began to
hydroplane and literally flew through the air. She was not seriously
injured but very stunned at the sudden occurrence!

When she explained to the highway patrolman what had
happened, he told her something that every driver should know - NEVER
DRIVE IN THE RAIN WTH YOUR CRUISE CONTROL ON. She had thought she was
being cautious by setting the cruise control and maintaining a safe
consistent speed in the rain. But the Highway Patrolman told her that
if the cruise control is on and your car begins to hydroplane -- when
your tyres lose contact with the pavement, your car will accelerate to
a higher rate of speed and you take off like an airplane. She told the
patrolman that was exactly what had occurred.

The Highway Patrol estimated her car was actually
travelling through the air at 10 to 15 miles per hour faster than the
speed set on the cruise control. The patrolman said this warning
should be listed, on the driver's seat sun-visor - NEVER USE THE
CRUISE CONTROL WHEN THE PAVEMENT 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 pavement is dry.

The only person the accident victim found, who knew
this (besides the patrolman), was a man who had had a similar
accident, totally written off his car and sustained severe injuries.

Anyone care to comment if this is true?
 
Re: Cruise Control, Do Not On When Driving In The Rain

That is very infomative... i really do not know that it is not advisable to use cruise control on rainy days. Point noted.
 
Re: Cruise Control, Do Not On When Driving In The Rain

Actually I'm not too sure if it's true or not. Waiting for the experts here to comment.
 
Re: Cruise Control, Do Not On When Driving In The Rain

/edited:

okay, so apparently this "tale" has been making it's rounds since 2002.

http://www.snopes.com/autos/techno/wetroad.asp

The best response I've seen so far is:

http://diodon349.com/General_Stuff/driving_in_the_rain__no_on_cruise_control.htm

I quote:

From: Jack Walker
Sent: Tuesday, November 09, 2004 12:35 PM
To: James Santos
Subject: RE: Emailing: driving_in_the_rain__no_on_cruise_control

Jim,

Let me clarify my previous email as I guess it is considered a somewhat "true" myth. I share the doubts about the details of the problem with the snopes website however.

If you are traveling at a fixed rate of speed, the wheels are turning at the proper speed. If you start hydroplaning, the cruise control would continue to turn the wheels at the same speed because that is what the cruise control is measuring. So the question arises, why does the car go faster if the wheels are turning at the same speed? If a hydroplaning situation, the wheels would be slipping through the water so the car motion would be slower than the apparent rotation of the wheels, not faster.

While I would agree that loss of control is a likely consequence of using the cruise control in rain, the apparent acceleration of the vehicle is a very dubious claim just by looking at the basic physics of the situation.

I would note that in times I've hydroplaned (without cruise control!) I did not note any sudden increase in speed. In that case, I was maintaining a fixed accelerator position so hydroplaning caused a noticeable increase in the wheel rotation as the drop in friction caused the engine speed to increase.

Jack

/end quote.

Also, I'd thought that with ASC/DSC, once wheelspin is detected (hydroplaning), then brakes will be applied to the wheel(s) that's hydroplaning? Thus reducing speed and increasing grip? I'dl trust that our German engineering would have thought about this.
 
Re: Cruise Control, Do Not On When Driving In The Rain

So this means that the chances of this happening to BMWs is either zero or very low. This however will not apply to cars without ASC/DSC rite?
 

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