con‧tra‧flow /ˈkɒntrəfləʊ $ ˈkɑːntrəfloʊ/ noun [uncountable and countable] British English
a temporary arrangement on a road that is being repaired, that makes traffic travelling in both directions use only one side of the road:
A contraflow is in operation between Junctions 6 and 12.

[TahlilGaran] Dictionary of Contemporary English ▲