The Highway Code states: 110 - Flashing headlights. Only flash your headlights to let other road users know that you are there. Do not flash your headlights to convey any other message or intimidate other road users.18 Feb 2011
If I'm stuck behind someone in the outside lane of the motorway and they are hogging the outside lane at 68mph, would my flash be interpreted as letting them know I'm there or intimidating them? Assuming of course that I'm a sensible distance behind them.
