I didn't check this on Snopes but it seems logical.

May

I wonder how many people know about this ~

A 36 year old female had an accident several weeks ago and totaled
her car. A resident of Kilgore , Texas , she was traveling between
Gladewater & Kilgore. 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 highway patrolman 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 highway patrolman told her if the cruise control is on when
your car begins to hydro-plane and your tires lose contact with the
pavement, your car will accelerate to a higher rate of speed making
you take off like an airplane. She told the patrolman that was exactly

what had occurred.

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, totaled his car
and sustained severe injuries.

If you send this to 15 people and only one of them doesn't know about
this, then it was all worth it. You might have saved a life. NOTE:
Some vehicles (like the Toyota Sienna Limited XLE) will not allow you
to set the cruise control when the windshield wipers are on.