If you are caught flashing your car’s headlights to warn other motorists about a mobile speed trap or upcoming camera you could face a large fine. Some drivers may think they’re doing you a good turn, but according to rule 110 of the Highway Code: ‘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.’ By flashing a warning, you could also be breaking the law according to the Police Act of 1996, by obstructing an officer in the course of their duties. Motorists caught breaking this law can be fined up to £1,000. According to research by Confused.com around one in six drivers in the UK are unsure this is an offence, don’t be one of them.