A British driver has been fined for flashing his headlights to warn fellow motorists of a nearby mobile speed camera site.
The practice of flashing to warn oncoming drivers is prevalent here and often much appreciated. But you can be done for your act of kindness.
God be with the days of the old AA Motorcycle Patrolman. If you were a member with your badge on the grille, if he didn't salute you when he met you, you knew the guards were down the road!