[noun] [C] [esp. UK] - a line of vehicles that have stopped or are moving only very slowly, because of an accident or other problem on the road in front of themYesterday there was a four-mile tailback on the main road into the city after a crash involving a truck and a car.
TAILBACK
Meaning of TAILBACK in English
Cambridge English vocab. Кембриджский английский словарь. 2012