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Sometimes, people incorrectly refer "reaction time" to the unrelated 60 foot takeoff time. The reaction time is merely an indication of how fast a driver reacted compared to when the green light came on. The 60 foot takeoff time is an indicator of how fast the vehicle started moving at the beginning of the race, regardless of the driver’s ...
Several measurements are taken for each race: reaction time, elapsed time, and speed. Reaction time is the period from the green light illuminating to the vehicle leaving the staging beams or breaking the guard beam. Elapsed time is the period from the vehicle leaving the starting line to crossing the finish line.
Although a quarter mile (1320 feet, 402 m) is the best known measure for a drag track, many tracks are eighth mile (201 m) tracks, and the premiere classes will run 1,000 foot (304.8 m) races. The race is begun from a standing start which allows three factors to affect the outcome of the race: reaction time, power/weight ratio, and traction.
E.T. (elapsed time) In drag racing, the total time a run has taken from start to finish. E.T. slip In drag racing, a slip of paper turned in by the race timer which denotes elapsed time for both drivers, and who won the race; it may also include reaction time and 60-foot time. This is an official document used for timekeeping.
Delay boxes improve starting line reaction time accuracy for drivers. Delay boxes do not do this autonomously. Driver interaction is still required to launch the vehicle and driver skill is still required to achieve a favorable reaction time. A small number of drag racers took to augmenting delay boxes, or paid technologists for circuitry to do so.
Reaction time is important, especially the closer a racer gets to the finals. Bracket racing is a relatively inexpensive and easy way to get into drag racing a sportbike. "This is a great class to come start in and once was the stomping grounds for many racing of the “Pro” riders today" (Series Information).
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A pre-2011 CompuLink drag racing Christmas Tree as currently in use on the Curacao International Raceway. Modern drag races are started electronically by a system known as a Christmas tree. A common Christmas tree consists of a column of seven lights for each driver or lane. Each side of the column of lights is the same.