Is a flashing rear light during the day a good idea?
-
- Posts: 34
- Joined: 21 Apr 2012, 10:27am
Is a flashing rear light during the day a good idea?
Pensioner returning to cycling for fitness, and afraid of being knocked off, consequently I was thinking of fitting a flashing rear LED to the pannier, and possibly a flashing front LED. However, I was wondering if they do any good and if they annoy drivers? Can they confuse a driver about the speed that a cyclist is traveling at? I remember when I was young, a driver pulled up alongside me and said “do you know you are doing 30 mph”! It’s unlikely that I can cycle that fast now but I expect that I can get up a fair lick.
Rides Raleigh Routier with improved spec.
Re: Is a flashing rear light during the day a good idea?
I think it's a good idea, especially on a busy road in poor light conditions. Just like high vis clothing, it improves the chances of a cyclist being spotted early and appropriate action being considered early.
-
- Posts: 2442
- Joined: 7 Jul 2008, 12:52am
Re: Is a flashing rear light during the day a good idea?
A rear light wont make any difference during the day - drivers most certainly can see you and have plenty of time to notice as they approach.
The problem with SMIDSYs is mostly in front of you - drivers trying to spot a gap in busy traffic as they try to join a busy road and having to make quick judgement. A flashing front light conceivably might help for these situations.
The problem with SMIDSYs is mostly in front of you - drivers trying to spot a gap in busy traffic as they try to join a busy road and having to make quick judgement. A flashing front light conceivably might help for these situations.
Re: Is a flashing rear light during the day a good idea?
In poor light conditions you should be using full lights.
The problem with hi Vis gear is that it doesn't eliminate the problem of 'seccades', i.e. drivers not looking long enough to register what is actually visible rather than what their brain is assuming is visible.
So best practise for cyclists is eternal vigilance.
The problem with hi Vis gear is that it doesn't eliminate the problem of 'seccades', i.e. drivers not looking long enough to register what is actually visible rather than what their brain is assuming is visible.
So best practise for cyclists is eternal vigilance.
Re: Is a flashing rear light during the day a good idea?
Probably in some cases.
Re: Is a flashing rear light during the day a good idea?
It depends.
There is a stretch of road that I drive and sometimes cycle on.
A steady cycle light looks like a motor vehicle light - but a flasher shows it is a cyclist.
It means at 50 mph in a car I can plan the overtake of a cyclist by moving into the second climbing lane and give the cyclist a wide berth.
As a cyclist it is terrifying to have a big car blast past without enough room.
Some cars seem to do over 80 mph on this stretch.
Other times it feels like the flashing light is unnecessary and even a distraction. Who knows.
If it means a cyclist does not get squished under the wheels of a Chelsea tractor it must be a good thing.
There is a stretch of road that I drive and sometimes cycle on.
A steady cycle light looks like a motor vehicle light - but a flasher shows it is a cyclist.
It means at 50 mph in a car I can plan the overtake of a cyclist by moving into the second climbing lane and give the cyclist a wide berth.
As a cyclist it is terrifying to have a big car blast past without enough room.
Some cars seem to do over 80 mph on this stretch.
Other times it feels like the flashing light is unnecessary and even a distraction. Who knows.
If it means a cyclist does not get squished under the wheels of a Chelsea tractor it must be a good thing.
- simonineaston
- Posts: 8003
- Joined: 9 May 2007, 1:06pm
- Location: ...at a cricket ground
Re: Is a flashing rear light during the day a good idea?
Agree no advantage to daylight lights, at all. Recall too that research indicates flashing lights (regardless of colour) are harder for viewer to assess distance, thus at night, two red lights at rear, one flashing, the other steady, can be beneficial.
S
(on the look out for Armageddon, on board a Brompton nano & ever-changing Moultons)
(on the look out for Armageddon, on board a Brompton nano & ever-changing Moultons)
Re: Is a flashing rear light during the day a good idea?
I'd be interested in any actual data about the effect of day lights (both front and back). On my DF I don't use them daytime in good weather. On my bent I do and have got myself a particularly bright rear pulse flash one (Lezyne Strip Drive Pro https://ride.lezyne.com/collections/led ... -drive-pro - reviews on internet say don't use full power at night). But I can't say if it helps as early days and I've had no issues but you never know if the light helped or not - need research. i.e. on either bike I have relatively few "incidents", not enough to make any counts useful or indicate anything.
Ian
Ian
-
- Posts: 4659
- Joined: 2 Aug 2015, 4:40pm
Re: Is a flashing rear light during the day a good idea?
My entirely personal feeling is that I get given more room from passing vehicles when I show a flashing daytime light on fairly narrow Welsh A and B roads.
-
- Posts: 2880
- Joined: 11 Jan 2007, 12:20pm
Re: Is a flashing rear light during the day a good idea?
I did an experiment. Compare flashing and continuous, and count what percentage of cars pull over far enough for the nearside wheels to cross the white line. I can't remember the actual figures now, but there were far more with the light flashing.PDQ Mobile wrote: ↑25 Sep 2021, 8:21pm My entirely personal feeling is that I get given more room from passing vehicles when I show a flashing daytime light on fairly narrow Welsh A and B roads.
“I'm not upset that you lied to me, I'm upset that from now on I can't believe you.”
― Friedrich Nietzsche
― Friedrich Nietzsche
Re: Is a flashing rear light during the day a good idea?
The eyes need to adjust when going from bright sunlight into dark wooded lanes, even more so if wearing sunglasses. A flashing rear light offers some protection against temporarily blinded motorists.
-
- Posts: 105
- Joined: 19 Mar 2013, 8:26pm
Re: Is a flashing rear light during the day a good idea?
Not sure that there's a definitive answer. I don't ride at night and almost all of my rides are on rural roads. Lots of drivers going fast on sometimes quiet roads.
I always ride with flashing lights front and rear. Rechargeable and bright.
I feel happier and that's a big thing as I'm sure that it 'wakes up' a few drivers each ride and that's just fine.
When I'm driving, I can see flashing lights well in advance (not round bends!) and have time to prepare.
Can't think of a reason not to use them
I always ride with flashing lights front and rear. Rechargeable and bright.
I feel happier and that's a big thing as I'm sure that it 'wakes up' a few drivers each ride and that's just fine.
When I'm driving, I can see flashing lights well in advance (not round bends!) and have time to prepare.
Can't think of a reason not to use them
Re: Is a flashing rear light during the day a good idea?
This is my impression.PDQ Mobile wrote:My entirely personal feeling is that I get given more room from passing vehicles when I show a flashing daytime light on fairly narrow Welsh A and B roads.
I don't wear hivis, but do use a high powered rear flashing light in daylight.
I'm convinced I get more space on Leicestershire roads (could be confirmation bias)
My opinion is that hivis being 'passive' fades into the background for /some/ drivers, but the 'active' flashing pushes the object into the foreground of consciousness for /all/ drivers.
I don't believe there's any scientific work on daytime lights, so it's all opinion and conjecture. Any opinion - including mine - is as good as the next.
Leicester; Riding my Hetchins since 1971; Day rides on my Dawes; Going to the shops on a Decathlon Hoprider
Re: Is a flashing rear light during the day a good idea?
They're horrible to ride behind. You can almost ignore them by day, by night the low-power ones twist the eyes out of your head while the high-power ones blind you. For me, until they produce one with built-in radar to switch the thing off when another rider comes up behind they're such bloody bad manners I won't have one.
Unfortunately, not everyone agrees with me.
Unfortunately, not everyone agrees with me.
Have we got time for another cuppa?
Re: Is a flashing rear light during the day a good idea?
I'm pretty sure I'm given more space with a flashing rear. I use a Garmin "Radar" which has the added feature that when a vehicle approaches the rate of flashing increases.
Did 100 miles on the A4 yesterday and not a single close pass, many drivers going to the opposite carriageway when possible.
(NB. The Radar also lets me know when a vehicle is approaching on my computer - handy in some cases).
Did 100 miles on the A4 yesterday and not a single close pass, many drivers going to the opposite carriageway when possible.
(NB. The Radar also lets me know when a vehicle is approaching on my computer - handy in some cases).