4 × 100 metres relay 4 × 100 metres relay The 4 × 100 metres relay or sprint relay is an athletics track event run in lanes over one lap of the track with four runners completing 100 metres each. The first runners must begin in the same stagger as for the individual 400 m race. A relay baton is carried by each runner. Prior to 2018, the baton had to be passed within a 20 m changeover box, preceded by a 10 metre acceleration zone. With a rule change effective November 1, 2017 that zone was modified to include the acceleration zone as part
One Lap of America at a time) without the benefit of support crews. The field of competitors is divided into several classes based primarily on original manufacturers suggested retail prices and number of doors. Competitors may make any modifications to their vehicles as they see fit but must run on a single set of tires, typically provided by the race sponsor, throughout the entire event, and vehicles must remain street legal with the modifications. Race track events are time trials with up to eight cars on track at a time. Competition is for fastest time rather than wheel-to-wheel racing. The first One Lap in