Safety Crews 
On asphalt rallies, priority drivers are supported by a safety crew which passes through the stages in advance of the competitors to report back on weather and surface condition, which may have changed following reconnaissance. Sometimes called gravel crews.

FIA-sanctioned technical officials who check the legality of WRC cars before, during and after each event.

Sequential Gearbox
The type fitted to most WRC cars. Gear selections are typically made by a steering wheel-mounted paddle rather than the traditional 'H' gate manual system typically found on production cars.

There are usually three service periods during a WRC day – 15 minutes in the morning, 30 minutes at lunchtime and 45 minutes in the evening. Teams can perform repairs or modifications to cars during these periods, and select their tyre choice for the following loop of stages.