Headlight flashing

When do you flash your headlights?

a) To say ‘hello’ to another driver you recognise.
b) To thank another road user for a courtesy they have given to you.
c) To let the driver of the artic joining from a slip road or pulling out of a layby know that you have seen them and that they can proceed because you’ll either pull out or slow down for them.
d) To let the artic that is overtaking you know that it’s safe to pull back in, thereby clearing the outside lane more quickly for following traffic.
e) To tell a driver trying to turn out into a slow moving line of traffic that they can do so.
f) To tell the middle lane hogger to move over to the empty inside lane.
g) To warn other road users of your presence.

The correct answer according to the Highway Code is the last one and only the last one. The correct answer in the real world (whether truck driver or car driver) is every one of those and more…EXCEPT for the last one.

For many years I’ve thought that the rule about flashing headlights should be either changed or omitted. I believe that for the Highway Code and driving instructors to stick rigidly to the dogma that headlights should only be flashed to warn other road users of your presence is not only pointless but actually dangerous. There is no point whatsoever in having a rule that is not enforced (and is pretty much unenforceable) and that is very very rarely obeyed by anyone. The fact that there are a few who do abide by the rule actually makes it more dangerous, not less.

When I first started riding bikes I did, occasionally, flash a car I was following to ‘alert them to my presence’ before overtaking them. I soon stopped that. Even if the car didn’t take it as an invitation to pull out, many drivers thought that a flash of headlights before I overtook was an aggressive signal, and reacted accordingly.

Consider another scenario. I was heading down to Kent for a meeting earlier this week (in my car). I was in the outside lane of the dual bit of the M11, ready to overtake two artics. The rear one was going faster than the one in front and although I wasn’t in an over generous mood - since I’d already been held up several times by artics overtaking at 1mph faster than the overtakee - I was prepared for the fact that it might pull out.

I got nearer and nearer, and at the same time the rear artic got nearer and nearer to the one ahead. I was pretty close when the driver finally decided to indicate to pull out. Since there was nothing close behind me I decided to let the artic out, partly so that it wouldn’t have to lose momentum and partly because I wasn’t convinced that the signal was an ‘indication of intent’ rather than a ‘give way because I’m pulling out now whether you like it or not’ type signal.

By that time the rear artic was pretty much up to the back doors of the trailer in front, and I wasn’t a million miles from the rear of the trailer that was signalling. So, it wasn’t just a matter of easing off the accelerator, I actually had to touch the brakes. Just in case it was an ‘indication of intent’, I flashed to let the artic know it could pull out. And it did so, very quickly, so that it didn’t clip the trailer in front and didn’t have to slow down. No, it wasn’t brilliant driving by the overtaking artic driver, but that’s not the point.

The point is that, bearing in mind how close I was, and my concern that the signal might have been an ‘I’m pulling out’ signal, it would have been perfectly in order to flash my headlights to WARN the artic driver I was there. Had I done so, and continued accelerating, things could have become a tad tricky.

I know that, and would not, therefore, flash in such circumstances as a warning. If I had flashed a warning of my presence and been crushed by the artic, it wouldn’t have helped me an awful lot to exclaim, with wounded righteousness, ‘but I signalled in accordance with the Highway Code’.

Take a new-ish car driver, out on the road, with the Highway Code fresh in their mind. Another vehicle flashes to let them out. They don’t go. The other driver has slowed and gets annoyed because their courtesy has been ignored, drives more aggressively as a result and mouths obscenities while vowing ‘never to let another numpty out in future’. Or, conversely, suppose the driver flashes correctly to warn of their presence and the other driver pulls out thinking it’s an ‘I’m letting you out’ signal. If there’s a crash, would the police really accept that the flasher (ooo, Betty) was blameless since they’d signalled correctly in accordance with the Highway Code?

We all know what the rule IS.

We all know that regardless of any rules we have to drive according to our own judgement, and proceed carefully even if someone flashes to let us out.

However, we all know what the reality is, and in my view that makes this rule about headlight flashing not only redundant but, in many cases, actually dangerous.

What do you think?

Cheers…M

only when im DOGGING :smiley:

As long as the flashing of the headlamps does not cause a problem to, or has the possibility of being misinterpretted by, another road user, then there should be no problem.
The problem is that many drivers flash without considering the above.

MartinC:
d) To let the artic that is overtaking you know that it’s safe to pull back in, thereby clearing the outside lane more quickly for following traffic.

If you wait until the minimum 2 second safety gap is in front of you before doing so - fine.
I’ll guarantee one thing if you wait for that gap, you will almost never flash one in as it will most likely pull in earlier and you will end up easing off to maintain a minimum safe distance.

This flashing in of large vehicles was sometimes necessary when they were made with tiny mirrors but these days the mirrors are that big that it takes a poor driver not to know where their rear end is…

only when im DOGGING

I’ll have to look that up in the trucker acronym thread. I assume it’s nothing to do with Rog’s comment…

know where their rear end is…

The problem is that many drivers flash without considering the above

You’re right Rog - but again, we’re talking about ‘what should be’. The fact is that we have ‘what it is’, and on that basis, I stand by the belief that the teaching on flashing is outdated and dangerous. IF we could get to a stage where every driver had to take an advanced test after, say, five years, and regular refresher tests, and if we could engender a positive desire of all drivers to continously improve their skills, then fine. But since that won’t happen, insisting on a rule that is unenforceable and not obeyed by the vast majority of drivers opens the door to many potential dangers that, in my view, far outweigh the ‘benefit’ of correct use of the flash.

I’ll guarantee one thing if you wait for that gap, you will almost never flash one in as it will most likely pull in earlier and you will end up easing off to maintain a minimum safe distance.

Exactly…after a two second gap the overtaking lorry would have no problem judging that it is safe to return. But meanwhile, the cars following would be getting annoyed by the delay in pulling in. Flashing the lorry in clears the outside lane quicker. Yes, it’s only a few seconds, but as we all know, everyone has to be whereever they are going without wasting a second. Again, my take on this flashing rule is not about how things SHOULD be on the road, but on how they actually ARE. I don’t see any realistic possibility of changing drivers’ behaviour when it comes to flashing, and on that basis - again - my view is that the rule on flashing is redundant at best and dangerous at worst.

Cheers…M

MartinC:
But meanwhile, the cars following would be getting annoyed by the delay in pulling in.

I am aware of them but it never bothers me whether i’m driving car or truck - I will not make myself the bad driver instead of them.

Many drivers let those behind determine how they should drive - not me - but I will give a long ‘intent’ signal in some situations if I think it appropriate - mainly to try and stop the silly [ZB}s going up the inside.

Hi Rog - I agree with all of that, including the ‘intent’ signal to try and prevent undertaking. I don’t and won’t disagree with any point you make about skilled driving and the importance of not being intimidated by other drivers. But the fact is that there are many unskilled and poorly trained drivers, and in this very specific case of headlight flashing, I think the rule is pointless and keeping it is potentially dangerous. If a risk assessment was done on that rule, I can’t believe that it would not be seen as a risk that should (and can easily) be avoided.

Cheers…M

A thought on ‘flashing someone out’

Vehicle waiting to emerge from a sideturn - you are approaching them and wish to let them out.

The ‘flash’ could be done to 'get their ‘attention’ as you slow right down and hold well back
OR
it could be ‘come out now’

This is where the onus is on the vehicle waiting to emerge to determine if it is safe or not.

Using the ‘flash out’ is not accepted as an excuse if an incident occurs

Anyone who flashes to say to the vehicle in the sideturn ‘I am here’ is asking for trouble as the flash could be misinterpretated and to be honest - why would anyone wish to get their attention in this fashion - if they are not looking in your direction then a horn would be a better option.

This is where the onus is on the vehicle waiting to emerge to determine if it is safe or not.

Absolutely, but let’s take as read the fact that all drivers should assess the safety of any operation and move only if it is safe to do so and without being pressured by others.

Anyone who flashes to say to the vehicle in the sideturn ‘I am here’ is asking for trouble as the flash could be misinterpretated

Exactly. ‘Flashing out’ is just one of the examples I gave, but the risk of misinterpretation holds true for all of them. So why have a rule that exacerbates the risk of being misinterpreted? Why continue to teach new drivers that the headlight flash is a warning of your presence when in reality that is probably the least common use of the flash. Occasions when the flash can be used correctly will be very rare - and even then will require (relatively) advanced skills to carefully assess the situation and in particular the potential responses and actions of other road users, in order to decide whether there is a risk of the flash being misinterpreted (such as the example I gave with the lorry pulling out when I was far closer than I’d want to be when following another vehicle).

Cheers…M

MartinC:
Why continue to teach new drivers that the headlight flash is a warning of your presence when in reality that is probably the least common use of the flash.

I suppose it depends on what they were taught and whether they were taught the possible misinterpretations of using it.

I don’t agree with taking it out of the Highway Code but the code could expand a little as to the possible general misinterpretations.

One Guy on a DSA test was driving down the road and flashed his headlights at a blonde walking on the pavement.

At the end of the test the examiner asked why did he flash his lights at the blonde … He replied i knew her i was just letting her know i was here.

To that the examiner replied OK… As per the highway code i am pleased to say you have passed.

flashing headlights " to let other road users know that you are there "

it is in the highway code if you want to look it up