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.
Never assume that flashing headlights is a signal inviting you to proceed. Use your own judgement and proceed carefully.
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
except when another road user poses a danger.
Law CUR reg 99