Do You Flash Your Headlights To Warn Other Motorists Of Speed Traps? If So, You Could Get Fined £1,000

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If you are driving along and you notice another motorist coming from the opposite direction flashing their lights at you, then it usually means a couple of different things. 

You have either forgotten to put your headlights on, you have left your weekly shopping on your roof, or there is a speed camera in front of you

If you ride a motorbike and a fellow biker approaches you having just gone through a speed trap, then a hand gesture is normally given to alert the other biker. 

Hand signals often used by motorcyclists

Of course, if you aren’t speeding, then you have nothing to worry about (assuming you are taxed, insured, MOT’d and have a valid driving licence). 

But if you have crept over the speed limit, then this unofficial ‘warning system’ will not only slow you down, but it could potentially save you from having to spend £100 on a ‘speed awareness course’.

And let’s face it, motoring is already expensive! 

But flashing your headlights at your fellow motorists to warn them about a speed trap could also land you with a £1000 fine. 

But if this rule is taken literally, then it also means flashing your lights to let other motorists pull out of a junction could even land you in trouble.

Unlikely, but possible. 

The maximum fine for obstructing a police officer is currently capped at £1,000. 

13 comments

    1. I flash because obviously there is a dangerous bit of road so to warn on coming traffic. If it wasnt dangerous there would be no need for the camera van

  1. Highway code say with fully obstruct a CONSTABLE , so is it an offence where the radar vans are operated by civilian employees?

  2. It is perverting the course of justice and can still land you a fine. Also civilians working these posts have devolved powers from the Chief Constable and so would have the same interpretation as “constable” in these circumstances in court, in the same way if you hindered a PCSO

    1. No they don’t. The Police Reform Act 2002 covers this point in detail, civilianised roles such as PCSO,s, Dedicated Detention Officers, National Crime Agency, Civilian Investigators etc are conferred certain powers specific to their role, however in the set of circumstances described, the CPS would not be able to prove a charge under S89 Police Act 1997.

    2. Parking in such a way to prevent the detection of a crime, I.e blocking the view of the camera would be obstruction surely, flashing your headlights and therefore preventing a crime allegedly taking place is surely not perverting the course of justice when there is no proof beyond reasonable doubt that an offence would have or indeed had been committed

  3. Unless the enforcement van is crewed with warranted Police Officers, or designated people (PCSO’s, NCA, DDO’s etc) covered under the Police Reform Act 2002, then Section 89 of the Police Act 1997 cannot be considered.

  4. If there is an obstruction on the other side of the road,like a breakdown or horses,and ,then there is bend where oncoming traffic would not be able to see it,then I flash my lights in the hope that they may realise that there could be a problem and be prepared.

  5. It’s only fair if danger imminent again to oncoming veh to flash to warn them its sensible thing to do .but as far as the cameras they are there for good reason and if traffic ignoring speed limits or without ins or mot that’s there problem and they need stopping

  6. Not strictly true. Police would have to prove your intent was to cause another road user to alter their action. Also the other road user would have to actually amend their action. So flash lights – police to prove it was as a warning of a speed trap and you wanted people to slow. Second the other vehicle must have been speeding and slowed down due to your flashing lights and not because of another reason (i.e. satnav warned of speed trap)

  7. If the law allows you to place van cameras where ever you want then I guess I got the freedom to flash who I want and when i want, you either a democratic country or a communist one, take time.

  8. No-one gets prosecuted for breeching something in the ‘Highway Code’. It is a code of expected behaviours, not the law! Agree with the posts relating to ‘evidence’. In this case ,IF a police officer see motorist flashing it’s lights, that alone is not an offence. The vehicle would have to be stopped then and there and the driver interviewed under caution. The stock reply to any such incident by the driver should always be ‘I was letting the other motorist know I was there’!

Let us know what you think!