According to the Highway Code:
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.
So when I flash my headlights to tell another user to go whilst at a crossroads, am I breaking the law? If so, is this something the police would pull me over for? I am not sure I know anyone or have seen anyone who actually uses this as a warning. Unless I have been reading this incorrectly and annoying drivers up and down the country.
Another misuse of car equipment is the car horn.
The Highway Code details:
The horn. Use only while your vehicle is moving and you need to warn other road users of your presence. Never sound your horn aggressively. You MUST NOT use your horn while stationary on the road or when driving in a built up area between the hours of 11.30 pm and 7.00 am, except when another vehicle poses a danger.
Obviously these laws do not apply to taxi drivers or buses
