<Dl> <Dt> R.T. </Dt> <Dd> Abbreviation for "Reaction Time". In drag racing, it refers to the time it takes for a driver to leave the starting line after the green light . This time can mean the difference between a win and loss, especially in closely matched races . </Dd> <Dt> Race Director </Dt> <Dd> An official appointed by a series organiser who holds ultimate authority over race operations throughout every event of a championship . The race director is the senior official present, and controls the activities of the local Clerk of the Course and marshals and the other staff appointed by the series . When appointed, they hold the responsibility of deploying the safety car and starting and stopping sessions . </Dd> <Dt> Racing line </Dt> <Dd> The fastest path around a circuit . </Dd> <Dt> Rainout </Dt> <Dd> When a race is delayed or cancelled due to rain, or the threat of rain . </Dd> <Dt> Rail (or rail job) </Dt> <Dd> dragster (as distinct from bodied car or flopper). From the exposed frame rails of early cars . Usually refers to early short - wheelbase cars . </Dd> <Dt> Rail (drag racing) </Dt> <Dd> guardrail </Dd> <Dt> Ramp run </Dt> <Dd> In a practice lap, to rev the engine as far as possible without changing gears to allow engine management systems to take Lambda readings of the fuel to air ratio across a smooth engine revolution range . </Dd> <Dt> Rattle gun </Dt> <Dd> See Impact Wrench . </Dd> <Dt> Reactive suspension </Dt> <Dd> A system by which the suspension is controlled by computer to maintain an optimum distance above the racing surface, regardless of forces acting upon the car and changes in the racing surface, thus maximising the aerodynamic assistance that can be gained by running the car close to the ground . Developed originally by Team Lotus in Formula One . </Dd> <Dt> Redlight (ed) </Dt> <Dd> (drag racing) a.k.a. bulb (ed)--jump (ed) the start, left before tree turned green . This is a loss unless a more serious (opponent crossing the center boundary line) foul occurs . </Dd> <Dt> Relief driver </Dt> <Dd> A driver who fills in for another driver in case of injury, or during a race because of exhaustion or pain . </Dd> <Dt> Restart </Dt> <Dd> The race is started again after a caution or other condition that stopped the race . In the case of a restart from a caution period on an oval track and most road courses, this is accomplished by the safety car pulling off the track, the green flag / light being displayed, and cars simply accelerating back to race speeds . </Dd> </Dl> <Dd> Abbreviation for "Reaction Time". In drag racing, it refers to the time it takes for a driver to leave the starting line after the green light . This time can mean the difference between a win and loss, especially in closely matched races . </Dd> <Dd> An official appointed by a series organiser who holds ultimate authority over race operations throughout every event of a championship . The race director is the senior official present, and controls the activities of the local Clerk of the Course and marshals and the other staff appointed by the series . When appointed, they hold the responsibility of deploying the safety car and starting and stopping sessions . </Dd> <Dd> The fastest path around a circuit . </Dd>

Who has ultimate authority at a race meeting