When the racer rolls forward into the stage beam, the front tires are positioned exactly on the starting line and the stage bulb is lit on the Tree, which indicates that the vehicle is ready to race. When the front tires of a vehicle break the first light beam, called the pre-stage beam, the pre-stage light on the Christmas Tree indicates that the racer is approximately seven inches from the starting line. Two light beams cross the starting-line area and connect to trackside photocells, which are wired to the Christmas Tree and electronic timers in the control tower. On each side of the Tree are seven lights: two small amber lights at the top of the fixture, followed in descending order by three larger LED lights, a green bulb, and a red bulb. These contests are started by means of an electronic device commonly called a Christmas Tree because of its multicolored starting lights.
The losing racer in each contest is eliminated, and the winning racers progress until one remains. A drag racing event is a series of such two-vehicle, tournament-style eliminations.
A drag race is an acceleration contest, on a track, or dragstrip, that begins from a standing start between two vehicles over a measured distance.
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