Camaro at launch, with Altered Vision in the right lane.Before each race (commonly known as a pass), each driver is allowed to perform a burnout, which heats the driving tires and lays rubber down at the beginning of the track, improving traction. Each driver then lines up (or stages) at the starting line.Races are started electronically by a system known as a Christmas tree. The Christmas tree consists of a column of six lights for each driver/lane, one blue, then three amber, one green, and one red, connected to light beams on the track. The blue is split into two halves. When the first light beam is broken by the vehicle's front tire(s) indicates that the driver has pre-staged (approximately 7 inches (180 mm) from the starting line), lights the first half of the blue circle, and then stages (at the starting line), which lights up the second half of the blue circle, and also the corresponding bar in the middle of that circle.[1] [2]Once the first competitor trips the staged beam, the tree is automatically activated, and the opponent will have up to seven seconds to stage or a red light and automatic timed-out disqualification occurs instantly. Otherwise, when both drivers are staged the tree will start the race between .8 and 1.3 seconds after the race is staged, with the time randomly selected by the Autostart system, which causes the three large amber lights to illuminate, followed by the green one. There are two standard light sequences: either the three amber lights flash simultaneously, followed 0.4 seconds later by the green light (a Pro tree), or the amber lights in sequence from top to bottom, 0.5 seconds apart, followed 0.5 seconds later by the green light (a Sportsman tree, or full tree). If the front tires leave from a stage beam (stage turn off) before the green light illuminates, the red light for that driver's lane illuminates instead, indicating 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. The green light automatically is illuminated on the opposite side of the red-lighting driver. Should both drivers leave after the green light illuminates, the one leaving first is said to have a holeshot advantage.Except where a breakout rule is in place, the winner is the first vehicle to cross the finish line (and therefore the driver with the lowest total reaction time and elapsed time). The elapsed time is a measure of performance only; it does not necessarily determine the winner. Because elapsed time does not include reaction time and each lane is timed individually, a car with a slower elapsed time can actually win if that driver's holeshot advantage exceeds the elapsed time difference. In heads-up racing, this is known as a holeshot win.[3] In categories where a breakout rule (some dial-in categories are this way, but Junior Dragster, Super Comp, Super Gas, Super Stock, and Stock most notably) is in effect, if a competitor is faster than their predetermined time, that competitor loses. If both are faster than their predetermined time, the competitor closer to that time wins. Regardless, a red light foul is worse than a breakout, except in Junior Dragster where exceeding the absolute limit is a cause for disqualification.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 starting line. Elapsed time is the period from the vehicle leaving the starting line to crossing the finish line. Speed is measured through a speed trap covering the final 66 feet (20 m) to the finish line, indicating average speed of the vehicle during the run last 66 feet (20m).In the standard racing format, the losing car and driver are removed from the contest, while the winner goes on to race other winners, until only one is left, based on a traditional bracket system (typically 4, 8, or 16 car brackets). In standard formats, the pairings are based on the lowest elapsed times. In bracket racing without a breakout (such as NHRA Competition Eliminator), pairings are based on times compared to their index (faster than index for class is better). In bracket racing with a breakout (Stock, Super Stock, but also the NHRA's Super classes), the closest to the index is favourable.A popular alternative to the standard eliminations format is the Chicago Style format (also called the Three Round format in Australia), named for the US 30 Dragstrip in suburban Gary, Indiana where a midweek meet will feature this format.[4] All entered cars participate in one qualifying round, and then are paired for the elimination round. The two fastest times among winners from this round will participate in the championship round. Depending on the organisation, the next two fastest times may play in a third, then fifth, and so forth, in consolation rounds.[5]Get Your FixAddictions and Other Vices*