Drag Race Timing System
There are alot of campanies work in this like:
RaceAmerica Drag Race Timing System
RaceAmerica Corporation, the Leader in Event Critical Timing Electronics, is located in Santa Clara,CA, the heart of the Silicon Valley. Founded in 1991, this privately held corporation brings innovative timing solutions to the automotive, industrial and [...]

christmas trees

There are two types of christmas trees
1. Sportsman tree:
used for bracket and handicap racing, consists of each yellow lighting 0.5 seconds after the one above it. The green comes on 0.5 seconds after the last yellow is lit. If the race is a handicap race each side of the tree will have its own [...]