Drive by wire, stop it!
I just bought a brand new new car, its a hyundai Tiburon. There is this nice braided stainless steel cable between my throttle body and my foot. This is a brand new 2009 model sports car.
I lift my foot, car slows down. There is your solution.
step 1 :profit.
wheres my freaking profit dammit!
Its a recipe for disaster using pure electronics to control the speed of an engine. In a device that often weighs over a ton, that can cause massive and greivous bodily damage. Resistors fail. Motors lock up. Drive MOSFETs get latched on, wires short circuit, capacitors short circuit or explode.
To be honest, i also wonder why these people dont work out to turn the damn ignition off, put the car in neutral, and push on their brakes with all their might. I understand that vacuum assist brakes dont work well when you have a wide open throttle, but they still work.
As i understand, there is NO physical device that prevents someone from turning the damn ignition off!!!