Flying the flag for increased passing distances.

It is clear that GM Police’s Operation Considerate is not going to change the toxic culture on the roads any time soon; in fact it seems to be going backwards rather than forwards. It is also clear that, whilst the announcement of plans for the Beelines walking and cycling network represents significant progress, it will be some time before we no longer have to share busy roads with dangerous motor vehicles. So what’s to be done?

Something we commonly hear from people who either can’t be bothered to think things through properly, or just wish to pursue their own anti-cyclist agenda, is that “cyclists must take some of the responsibility for their own safety”. They usually use this flawed rationale to claim that cyclists who don’t wear helmets or high visibility clothing “deserve everything they get”, or to assert that it is the responsibility of cyclists to make sure that motorists don’t drive into them. I don’t think these people imagine for one moment that cyclists might take their assertion literally.

With this in mind, I got to thinking about what I can do in the short term to change the behaviour of those drivers who either can’t be bothered, or wilfully and maliciously don’t want, to leave enough space when passing me in their motor vehicles. One thing that I tried 30 years ago in an attempt to achieve this was to attach a little plastic flag on a stick to the offside of my bicycle. It was useless because the flags and “lollipops” that you can buy are so short that they barely extend beyond the handlebars of the average bike. But what if the flag were wider; could that have an effect and what would be the problems?

Protecting a seven year old child

As my granddaughter is now too big for her child seat, we’ve taken to using a tagalong attachment (“Trailgator”) to allow me to attach her little bike to the back of mine. I ride 4 miles across town and back just to take her on this short ride to school, and she loves it. But I worry about taking her on even quiet roads on it, and am terrified of taking her on any busier routes, so I thought I’d start on that problem by experimenting with a much wider version of the flag. Here is a picture of the setup:

Now, many people might think it looks a long way out, and it does make a small number of people (or rather some drivers) rather furious (more about that later), but let’s apply some rational thought to this. Drivers are expected to leave a gap of 1.5 metres when passing people on bicycles at 30 miles-per-hour. The flag shown here extends exactly 1 metre out from the centre line of the bicycle so, allowing for the fact that my handlebar extends 30 cm out, anyone hitting the flag must be no more than 0.7 metres away from me and my 7 year old granddaughter. This is less than half the gap the drivers are supposed to leave anyway, so it should not be a problem at all.

Here is some other information about the flag. The pole is a fibreglass rod that came from a dome tent that we got rid of. The flag is one that was intended for a car to wear during some sporting event years ago, with the bracket cut off, fastened to the pole with a couple of cable ties. The pole is attached to the bike by means of an elastic bungee cord (left in the picture below), making it easy to attach and detach and allowing it to fold back and forth if it hits, or is hit by, something (right).


I have taken my granddaughter to school with this arrangement on three days this week and it works fine. There is one road where drivers too often would try to overtake when we are passing parked cars, and that hasn’t happened since we started using the flag; drivers have been waiting behind until it was safe to pass at a suitable distance.

Of course it doesn’t address every concern. One problem it doesn’t address is tailgating, like this idiot who thought it was OK to drive half a second behind a 7 year old child:

and that happens pretty much every day at that point, but at least we have a start on solving some of the problems. (I’m sure it must be just a coincidence that this driver is wearing the four rings of stupidity badge.)

OK, I imagine few people will object to what seems (to the unthinking idiot) like an extreme measure if it’s done to protect a small child from death or injury, but what about that small child’s grandad?

Protecting the Grandad.

I decided on the second day to experiment with using it even when I didn’t have my granddaughter along, when I’m riding on roads where lots of drivers put my safety in danger on a regular basis. Here is a sample of the results.

The following video shows 6 of the many overtakes I experienced on my journey home from taking her to school the day before I started using the flag:

All of these are uncomfortable to some degree, some are worrying, and the last one was downright dangerous and probably deliberate. Note, by the way, that the Operation Considerate officer didn’t consider that last one there worthy of pursuing, but that’s a different story!

The next video shows all of the overtakes from the same journey the next day, when I started using the flag:

I’ve never felt more relaxed on these roads than I’ve felt since I started using this flag; the difference is amazing. Every single driver seems to be passing further away than drivers normally do, and the careful ones are giving me easily the full 1.5 metres of clearance – something that is normally very rare indeed. Even the driver of the yellow bus that passed closer than he should have done gave me more clearance than most bus drivers do at that point.

Pinch Points

One of the perennial problems that cyclists face is drivers racing to try to get in front approaching a pinch point such as that formed by a pedestrian refuge. Here is one example from the last few weeks:

This is another case of very careless and inconsiderate driving that the Operation Considerate officer decided was not worth pursuing. In fact, it was this one that got me thinking again about what I can do myself to change matters if the police aren’t prepared to help.

Here is what happened today at a much wider pinch point than the one above:

The driver waited patiently behind until I was past the hazard before overtaking nice and wide. Now it may be that this driver would have shown the same consideration even without the flag, but I have not once been cut up at a pinch point since I started using it – something that is otherwise very common.

Road position

The above two video clips illustrate something else that is different with the flag. One of the tiring and stressful aspects of cycling according to Bikeability principles is the need to move to the primary road position (the centre of the lane or traffic flow) whenever you feel that it is not safe to be overtaken. Pinch points are one example, where you are expected to move out into the middle of the lane at precisely the point where some drivers seem desperate to get past in a pointless attempt to save a couple of seconds. In the second video there, I felt no need to move out from the secondary position (between 0.7 metres and 1 metre from the kerb), so the whole experience is far more relaxed. In general, with the flag, I find I am much more often comfortable to ride in secondary position, or at least more to the left of the lane.

Taking primary position is particularly stressful when there is a dangerously designed cycle lane that you would be wise to avoid using, such as this one:

For years now, as a result of these and other experiences, I have been riding through that whole section of road in primary in the inside of the two straight ahead lanes, ignoring the cycle lane altogether, but am frequently subjected to aggression, horn-blowing, tailgating and punishment passes, especially from road-raging bus drivers:

So here is how, as an experiment, I rode it today:

Now I’m not sure I will continue to use the cycle lane in the future – we’ll have to see how it goes, but it does seem less stressful now that I have the flag.

Right turns, filtering and overtaking

Of course, there are some limitations introduced by having a rod sticking out 70cm from the side of your bicycle. One obvious one is that filtering past traffic queues either on the left or between lanes becomes impossible, and filtering on the right is difficult. Had I still been commuting a 25 mile round trip to work and back on extremely busy roads in rush hour traffic, that would render the use of such a device impractical. However, nowadays, I find I rarely have a need to filter. Even if the need arose, it would be a matter of around 30 seconds to stop and detach the flag pole, stowing it along the top bar of the bike. I realise that to some drivers losing 30 seconds of time in getting to the next traffic light seems like the end of the world, but on a bike we tend just to take such things in our stride.

Overtaking, passing parked cars, and making right turns, are all actions for which the presence of the flag introduce constraints that are somewhat similar to those faced by car drivers when there are oncoming motor vehicles. However these can be partially mitigated due to the way the flag is mounted. As it is just held by the loops of a bungee cord, it is quite easy to reach down and shorten the extension of the flag whenever I need to:

As long as the rod doesn’t extend further than the handlebars on the nearside of the bicycle, this should not be a problem, so I can retract it by about 30cm, leaving 40cm sticking out to on the right, which is generally not a problem. I’m still experimenting with this and may end up shortening the flag by perhaps 10cm, after which the range of extension will be from 60cm down to 30cm when fully retracted.

The most awful right turn?

There is one right turn that I have to make pretty much every time I ride home from anywhere to the south:

This is a problem because there is no road position that you can take up without having a great many drivers wilfully putting you in danger as you wait for oncoming traffic, often with a dose of road rage. This phenomenon is very strange because I have yet to see anyone raging at a car or van driver because they are blocking the lane waiting for oncoming traffic, which happens frequently. There is a detailed explanation of the problems in this Twitter thread. Unfortunately, as you can see from the thread, the officer making decisions at Operation Considerate again does not consider these cases to be worthy of any action. So how does having the flag improve the situation?

Well, the reason I turn right there is to go onto a route that avoids my having to ride up a fairly steep hill through an absolutely horrendous junction. Believe it or not, under normal circumstances, the right turn here is preferable to that. However, that situation is completely reversed by the presence to the flag; here is a video clip of this morning’s ride through the horrendous junction, starting from the traffic lights just after the awful right turn:

Yes, drivers are held up more because of my using this route instead of the quiet one, but it is worth it for my safety; and anyway, that is the fault of a few angry, dangerous drivers, so they only have themselves to blame

Knuckle draggers and idiots

Of course, whilst most drivers understand the reason for doing something like this, there are always a few idiots who perhaps don’t have the brain capacity to do anything other than object in irrational ways, like these:

or this idiotic, tailgating, horn-blowing van driver:

In this case, I was riding along Ashworth Lane, which is 795 metres long, and I covered the distance in 1 minute and 40 seconds. That is an average speed of 18 miles-per-hour on a road with a 20 miles-per-hour speed limit, bearing in mind that there were several places where I was able to proceed but the van driver would have to wait for oncoming traffic. I do wonder how we got into the situation where people of such limited intelligence are able to obtain a licence to drive a motor vehicle in a public space.

And you will always get the road ragers like this one trying to do punishment passes whilst screaming through the window:

but, though this one was only about 15 cm away from the flag, he was 85 cm away from me; far too small a distance, but further away than such idiots would normally pass.

One effect I have noticed is that this really separates out the reasonably competent drivers from the aggressive raging idiots because, with the flag, far fewer drivers pass close just because of ignorance. Close passes seem pretty much always deliberate when you have a big flag like like this.


I’m still experimenting with this and I don’t yet know whether I’ll make it a permanent feature of my riding. However, it does seem very effective, only forces drivers to do what they should be doing anyway and, whilst some people might think it a bit weird, it is a rational solution to a frankly awful situation.

What I have decided for certain is that I will always have this flag on the bike whenever I am riding with my granddaughter on the tagalong on the roads. I set myself a goal about 5 years ago in relation to my cycle campaigning, that my granddaughter would be able to ride a bicycle to school by the time she is eight years old. Well, things haven’t quite worked out as I was hoping, though Chris Boardman’s efforts look as though they will bear fruit, but I can claim that I have achieved that goal, albeit in an unorthodox way.

Addendum: 13th August 2018

The Mk3 cycle safety flag

Not long after I published this article, I had need to cycle the 30 mile round trip to Manchester and would be returning after dark, so I made up a new safety flag that has an orange fluorescent plastic paddle with a red reflector on the back face and a white one on the front:

The paddle itself was a commercial safety reflector from Decathlon, with the mounting bracket cut off:

Like the flag, it is just fastened to the end of the fibreglass tent pole with a couple of cable ties. I also put a piece of old inner tube under one of the cable ties for added stability. (You can pull the cables ties tighter with this in and it stops things rotating.)

The finished article is 10cm shorter than the one with the flag:This length, which extends out to 60cm away from my right hand side, still seems to serve its purpose, although I have been cut up a couple of times, which seems deliberate. [Update, 28th August 2018: after some bad experiences, I have now remounted the paddle so that it sticks out the same distance as the flag version (70 cm beyond the bar-end on this bike)]

Initially (the Mk2 version), I had a problem with the paddle rotating in the wind so that it would be edge-on to the driver behind. So I solved this by adding a device to the mounting end to stop the rod rotating:

The device just slides round the edge of the rear carrier when the flag is extended. It is made from a plastic fixing block,

a plastic spoke reflector (but any bit of fairly rigid plastic tube would do), three cable ties and another bit of old inner tube

I also added another cable tie with a bit of inner tube under it part-way along the fibreglass rod. This acts as a stop so that when I retract it, it will only move in 30cm so that it doesn’t stick out too far on the left. The paddle sticks out only 30cm to the right when it is retracted, so filtering in cycle lanes is not a problem.

1st October 2018: I ended up extending the newer flag to the full 1m (70cm extension). The finished version is shown here:

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15 Responses to Flying the flag for increased passing distances.

  1. Dave James says:

    Having had my knuckles scrapped from a guy undertaking me waiting to turn right, you do right, stay in the middle of the lane, own the road, I could have been knocked into the oncoming stream of traffic.
    good work on the investigation.

  2. Donna McCarron-Flynn says:

    This is a brilliant site – thank you. I am just beginning, at 49, to ride my bike on the road. Just got an electric bike to help with the hills in Edinburgh. My husband is going to ‘McGuyver’ me this 1m long flag in order to help with safety; cycling in Edinburgh is a nightmare, but I am taking a stand for the environment, for my fitness, for a change to the way folks get around a city.

  3. debrastorr says:

    I recently started using a flag. It’s not your full metre because I used a telescopic inspection tool as the base. But it’s easy to adjust the length according to Road : I switch at one point from a 70mph dual carriageway to a shared cyclepath.

    I started with a similar attachment to you on carrier but now use velco straps under the saddle – the higher position helps.

  4. debrastorr says:

    I made a telescopic version that I can adjust on the fly.
    Yes, I agree, it acts as a reminder to most and a deterrent to the idiots.

  5. You might be interested in anoher take on this idea I and friends have been trialing. I haven’t made it extra wide although I could – it’s more a hint that clearance is requested, and mostly it seems to work. It can’t get caught up on obstructions, will flick back out of the way (doesn’t depend on the fibreglass to do so) and can be deployed/retracted while in motion. Pics and parts available for download on Thingiverse….


    • Hi. Yes, that’s interesting, and good use of a 3D printer. Just to be clear, though, My flag doesn’t rely on flex in the fibreglass, which is actually quite stiff, to move when hit. The mounting acts as a hinge as the left or right bungee stretches depending whether it is hit from the front or the rear. See the second and third images in the article.

    • The thingiverse link returns a 404. What was your idea?

  6. alanfranz says:

    The thingiverse link returns a 404. What was your idea? Is it available somewhere else?

  7. Jez says:

    Having just had a very close passing encounter with a motorist, who then tried to run me over when I caught up with him and tapped on the window for a chat, (managed to bump my rear wheel with his bumper but no damage – didn’t get the plate sadly) I found your flag very interesting. I will stay off the main roads for now, as I cycle for pleasure rather than fitness – but I’ll have a see whether I can build something similar.

  8. says:

    whats wrong with using a bike safety flag horizontally rather than vertically?

    • Not sure what you mean. It is horizontal.

      • Helen says:

        I was thinking the same thing as Martin before I found your blog. I was thinking of using a safety flag that’s normally used vertically at the back of the bike and turning it horizontally. I wasn’t sure how I was going to attach it though. I think that’s what Martin means anyway. The vertical flags seem to be much more popular in America.

        My cycle home from work is mostly on a 80km/h road. I only cycle occassionally as I’m sick of cars getting too close.

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