An abnormal state of a road or motorway where the traffic temporarily travels in the opposite direction to normal, usually as a result of repair work or an accident
A contraflow is a situation in which vehicles travelling on a main road in one direction have to use lanes that are normally used by traffic travelling in the opposite direction, because the road is being repaired. a contraflow between Junctions Eleven and Twelve of the M5. a temporary arrangement on a road that is being repaired, that makes traffic travelling in both directions use only one side of the road