Use cruise control. This is not need feature as it already exist's in some form.
Wrong. Cruise Control makes it so the speed does not change, the limiter makes it so the speed does not go above XXX KPH/MPH, that means you can still change the speed.This idea is AWESOME. I ALWAYS used the speed limiter on Mafia: City of Lost Heaven. If this would be created you could always drive in a chilled way, slowly, and you'd still be able to change the speed - just not above.. 60 KPH.