Glossary of Motorsport Terms
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- Jet dryer - An airplane engine mounted on a pickup truck or trailer. The exhaust from the engine is used to blow debris or evaporate moisture from the racing surface.
- Jump start - When a driver moves off his grid position before the five red lights have been switched off to signal the start of the race. Sensors on the circuit detect premature movement of any car and a penalty is imposed on the driver.