A rev limiter is a device fitted to an internal combustion engine to restrict its maximum rotational speed. This is usually carried out to prevent damage to the engine, however sometimes these devices are fitted to prevent an engine reaching the point at which it develops maximum power. This may be useful in a driving school car or similar, or utilised in systems preventing Valet parking operatives from joy-riding in high performance vehicles placed in their charge. When fitted to racing or modified street cars these adjustable devices provide more precise control than the original components built in by the manufacturer. Limiters can be used in conjunction with a shift light, which illuminates when the desired RPM is reached, indicating to the driver that a gear change is required. This allows the driver to keep his eye on the road and not have to glance repeatedly at the tachometer to monitor the engine speed.

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