How do speed limiters normally work?

Explanation: Most speed limiters work by taking a speed signal from the tachograph and transmitting it to the engine management system. This reduces the fuel supply to the engine, and allows the speed of the vehicle to be controlled to specific limits. The speed at which a limiter is set must be shown on a plate clearly displayed in the cab. You should be aware of the effect a speed limiter will have on your vehicle, especially when overtaking.

Category: Vehicle Weights and Dimensions

References: The Official DVSA Guide to Driving Buses and Coaches: Section 1