1. two second rule - Noun
2. Two second rule - Proper noun
two second rule
a rule of thumb by which a driver may maintain a safe following distance, allowing at least a two second interval behind any vehicle that is directly in front of the driver's vehicle.
two-second rule
(transport, idiomatic) A rule of thumb for safe driving by which a driver must maintain a two-second distance from the vehicle in front.
two-second rule