contraflow

/K AA1 N T R AH0 F L OW0/
noun
  1. 1

    Flow in the opposite direction to normal.

    โ€œExample: Contra-flow cycling is a regulatory measure. In streets and roads with a one-way traffic restriction, cyclists are exempt from the one-way restriction and are allowed to drive against the flow of motorized traffic. (European English)โ€

  2. 2

    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.

Source: https://en.wiktionary.org/wiki/contraflow