That indicates the vehicle is ready to race. When the racer rolls the car into the stage beam, the front tires are exactly on the starting line and lights the bottom half of the blue light. That means the racer is about seven inches from the starting line, approaching the starting line and the “staged” position. When the front tires of a race car break the first of those two light beams, the top half of the blue light comes on. The top half-moon blue light is the pre-stage indicator. The NHRA Christmas Tree has used different colors through the years. Both the top and bottom half of the blue lights interact with two light beams that cross the starting-line area and are connected to trackside photocells that are wired to the tree and electronic timers in the control tower. The blue lights made their debut before the 2011 spring race at Charlotte, N.C. The blue light is actually two lights, two half-moons. The process starts with the blue light at the top of the apparatus. It’s the electronic starting device that uses calibrated LED lights that produce a visual countdown for each pro driver in an NHRA pairing.
But it does have flashing blue, amber, green, and red lights. The Christmas Tree that everyone is talking about at a drag race isn’t the fancy evergreen we display in our living rooms during the holidays.
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