10/07/2026
What is a speed limiter
A speed limiter is an electronic device in a vehicle designed to prevent the car from exceeding a driver-selected or manufacturer-set speed.
Unlike cruise control, which maintains a constant speed, a speed limiter acts as a "ceiling." You can accelerate freely up to your chosen limit, but once you reach it, the engine management system restricts further power to keep the vehicle from going faster—even if you press the accelerator pedal all the way to the floor.
How It Works
Setting the Speed: You typically set the speed via steering wheel buttons or a stalk.
Active Restriction: As you approach the set limit, you will feel resistance in the pedal. If you maintain the speed, the car will simply hold that pace.
The "Kick-down" Override: For safety reasons, if you need to accelerate quickly to avoid a hazard (such as overtaking or merging), you can usually override the limiter by pressing the accelerator pedal firmly past a mechanical "detent" or click-point at the bottom of its travel. This immediately restores full engine power.
Why Use One?
Traffic Compliance: In areas with strict speed enforcement or variable speed limits, it helps prevent accidental speeding.
Fuel Efficiency: Maintaining a steady, lower speed can help reduce fuel consumption on long motorway journeys.
Fatigue Reduction: It removes the need for constant monitoring of the speedometer, allowing you to focus more on the road ahead.
Important Distinction
Do not confuse a speed limiter with an Intelligent Speed Assist (ISA) system. While a limiter is manually set by the driver, an ISA system uses cameras and GPS data to read road signs and automatically adjust the vehicle's speed limit setting based on the current legal limit of the road you are traveling on.