From Longman Dictionary of Contemporary Englishcontraflowcon‧tra‧flow /ˈkɒntrəfləʊ $ ˈkɑːntrəfloʊ/ noun [countable, uncountable] British English TTRa 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.
Examples from the Corpus
contraflow• There's a contraflow between junctions 15 and 16 near Swindon.• But the police blame the tailbacks on motorists driving too fast through the contraflow and causing accidents.• In the meantime, motorists caught speeding through the contraflow can expect to receive a court summons in the post. 