Question

Are driving on a highway you suddenly discover that your gas pedal is jammed and you cannot reduce engine powered you decide to turn off your engine power you must be careful because

Answer 1

you now have no control over steering or any other function of the car.

Answer 2

When you turn off your engine power you will reduce the speed but at the same time, you will no longer have control over the car. By turning off the engine, the brake pedal will stop working as well as the steering wheel that would begin to jam.

To reduce the engine power is the gas pedal is jammed you need to reduce the gear level.

I hope this answer helps you.