What does ‘direction of departures’ mean?

Why does the Bison Futé service ( bison-fute.gouv.fr) use the expression ‘in the direction of the departures’ or ‘of the returns’ when warning of traffic congestion? What does it mean? P.J.

Published Last updated

This expression has been criticised as too Paris-orientated, but basically ‘departures’ refers to traffic heading from north to south (towards the Mediterranean) or west to east (towards mountain resorts in the Alps); returns is the opposite.