FMVSS 124

Accelerator Control Systems

This Standard applies to MPVs, trucks and buses. It establishes requirements for the return of a vehicle’s throttle to the idle position when the driver removes the actuating force from the accelerator control, or in the event of a severance or disconnection in the accelerator control.

Applicability:

Trucks & MPVs 10,000 GVWR or Less Yes
Trucks More than 10,000 GVWR Yes
Buses 10,000 GVWR or Less Yes
Buses More than 10,000 GVWR Yes
Trailers No 

Read the Complete Standard