Drag racing
Below the staging lights are three large amber lights, a green light, and a red light. When both drivers are staged, the tree is set to start the race causing the three large amber lights to illuminate, followed by the green light.  If the front tires leave the starting line before the green light illuminates, the red light for that driver's lane illuminates instead. This indicates disqualification (unless a more serious violation occurs). Once a driver commits a red-light foul (also known as redlighting), the other driver can also commit a foul start by leaving the line too early but still win, having left later. Should both drivers leave after the green light illuminates, the one leaving first is said to have a holeshot advantage.