Editing Transponder (section)

===Lap timing===
Transponders are used in races for lap timing. A cable loop is dug into the race circuit near to the start/finish line. Each individual runner or car has an active transponder with a unique ID code. When the individual passes the start/finish line, the lap time and the racing position is shown on the score board.{{cn|date=May 2024}}

Passive and active RFID systems are used in [[motor sports]], and off-road events such as [[Enduro]] and [[Hare and Hound (Motorcycle Race)|Hare and Hounds]] racing, the riders have a transponder on their person, normally on their arm. When they complete a lap they swipe or touch the receiver which is connected to a computer and log their lap time.{{cn|date=May 2024}}

[[NASCAR]] uses transponders and cable loops placed at numerous points around the track to determine the lineup during a caution period. This system replaced a dangerous [[Racing back to the caution|race back to the start-finish line]].{{cn|date=May 2024}}