The distance you can see to be clear to stop in at night?

The distance you can see to be clear to stop in at night?

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Beyond Rational

Original Poster:

3,527 posts

221 months

Wednesday 16th September 2009
quotequote all
Last night I was driving down a very dark section of motorway using dipped beams due to traffic on the other carriageway. The car has 'normal' headlights - nothing special but working properly and adjusted correctly.

The thing that occured to me, was that if there was a low, non reflective object blocking the road, at 70mph I very much doubt I would be able to see it, react and stop in the distance provided by the lights.

What would others do in this situation? (ignoring the merits of aftermarket HID lights for now)

p1esk

4,914 posts

202 months

Wednesday 16th September 2009
quotequote all
Beyond Rational said:
Last night I was driving down a very dark section of motorway using dipped beams due to traffic on the other carriageway. The car has 'normal' headlights - nothing special but working properly and adjusted correctly.

The thing that occured to me, was that if there was a low, non reflective object blocking the road, at 70mph I very much doubt I would be able to see it, react and stop in the distance provided by the lights.

What would others do in this situation? (ignoring the merits of aftermarket HID lights for now)
I expect a great many drivers, including some advanced drivers, do not cater for the situation you describe, if they are honest about it.

Best wishes all,
Dave.

firstmk1

82 posts

222 months

Wednesday 16th September 2009
quotequote all
If possible, use the lights of those ahead to give you an early view of the road surface.

verbal kint

26 posts

181 months

Wednesday 16th September 2009
quotequote all
This is a very good point. The answer is that you can't or at the least it is very difficult. Two friends of mine were killed on a stretch of road in kent a couple of years ago down to exactly this point. A police car a motorbike and a lorry were involved. The biker was also killed.

This triggered the lights for life compain (spearheaded by my friends mother)to have these types of roads illuminated. So far she has had this stretch of road lit!

Please give generously to this compain if you get the chance.

RIP guys.


davepoth

29,395 posts

205 months

Wednesday 16th September 2009
quotequote all
It really doesn't take much. A scaffolding pole across a lane would be virtually invisible at 70mph in the dark and would almost certainly cause a crash. The only answer is to slow down to a more comfortable speed. Which in itself is dangerous on the motorway at night.

WhoseGeneration

4,090 posts

213 months

Wednesday 16th September 2009
quotequote all
Beyond Rational said:
Last night I was driving down a very dark section of motorway using dipped beams due to traffic on the other carriageway. The car has 'normal' headlights - nothing special but working properly and adjusted correctly.

The thing that occured to me, was that if there was a low, non reflective object blocking the road, at 70mph I very much doubt I would be able to see it, react and stop in the distance provided by the lights.

What would others do in this situation? (ignoring the merits of aftermarket HID lights for now)
Good question to raise and one I have thought about.
"We" are not good at seeing in the dark, unless there is no other light.
Try it, go for a walk out in the country, away from light pollution.
That's walking though, our "natural" pace.
So, we can now travel faster but needing artificial light to enable that.
The faster we want to go, the more illumination we need, why those who Rally at night, Road or Stage, bolt on as many lights as regulations allow.
Dipped though?, as you say, a real problem.
However, what I have observed is that, if the tarmac is grey, rather than black, it's easier to detect any objects in the carriageway.
Question to those who specify road surfaces?
I do think that car light designers should consider dipped beam performance more.
Or, perhaps we need some very low level, long range beams to illuminate the road surface?

loomx

327 posts

231 months

Thursday 17th September 2009
quotequote all
Well you cant use main beam when other cars are around, but thier lights will be lighting the road to allow you to see further anyway.

When their arnt other cars, use main beam?

Oops, didnt read the OP properly, I agree about motorways, TBH I use main beams sometimes on motorways with oncoming traffic anyway.
I never had a problem with other people using main beam in on-comming traffic beams on motorways/dualcarridge ways. Yes you can tell thier lights are brighter, but they dont dazzel or blind you.

Edited by loomx on Thursday 17th September 11:24


Edited by loomx on Thursday 17th September 11:26

RobM77

35,349 posts

240 months

Thursday 17th September 2009
quotequote all
This has always bugged me. I like to drive at a speed where I can react and stop within the distance seen, and at night with dipped beam that's probably about 20mph!! I used main beam where I can, but the rest of the time, yes, I reluctantly accept an increased level of risk.

StressedDave

841 posts

268 months

Thursday 17th September 2009
quotequote all
Actually, if you bother to do the maths, it's about 40-45 mph rather than 20 mph.

RobM77

35,349 posts

240 months

Thursday 17th September 2009
quotequote all
StressedDave said:
Actually, if you bother to do the maths, it's about 40-45 mph rather than 20 mph.
Thanks smile 20mph was a complete guess and not really a serious figure. I'm surprised it's that high, but thanks, I've never quite got round to working it out.

fwaggie

1,644 posts

206 months

Thursday 17th September 2009
quotequote all
loomx said:
I never had a problem with other people using main beam in on-comming traffic beams on motorways/dualcarridge ways. Yes you can tell thier lights are brighter, but they dont dazzel or blind you.
The fact you don't have a problem with oncoming main beams at night does not imply that everyone else is happy with it.

I absolutely hate being dazzled, motorways or not.

And if "you can tell thier lights are brighter" your eyes have already compensated for the brighter lights, reducing what you can see in front of you even more.

Here's hoping the police see, stop and have a "word" with you to explain why you're being an idiot.

Distant

2,362 posts

199 months

Thursday 17th September 2009
quotequote all
loomx said:
TBH I use main beams sometimes on motorways with oncoming traffic anyway.
I never had a problem with other people using main beam in on-comming traffic beams on motorways/dualcarridge ways. Yes you can tell thier lights are brighter, but they dont dazzel or blind you.
Please don't do this, your bright lights shining straight into the eyes of traffic coming the other way reduces their visibility. Yes, you'll be able to see more, but at the expense of everyone else seeing less?? It's not only inconvenient for other road users, its selfish and dangerous.

Distant

2,362 posts

199 months

Thursday 17th September 2009
quotequote all
Beyond Rational said:
Last night I was driving down a very dark section of motorway using dipped beams due to traffic on the other carriageway. The car has 'normal' headlights - nothing special but working properly and adjusted correctly.

The thing that occured to me, was that if there was a low, non reflective object blocking the road, at 70mph I very much doubt I would be able to see it, react and stop in the distance provided by the lights.

What would others do in this situation? (ignoring the merits of aftermarket HID lights for now)
I was having this very same conversation with myself during a boring journey last night. I concluded that it's just not possible to stick to the golden rule when driving at night on unlit roads. Use the clues you get from other vehicles lights and main beam as often as possible, even just for a second will help. Do what you can to minimise the risk and there isn't much more can be asked of you.

I remember a traffic cops type programme where some guy was hit and killed on an unlit section of dual carriageway. Terrible for the driver of the car that hit him, but the police said the driver couldn't have been expected to see him in the dark.

I've got factory fit HID lights and they're great at giving you more vision within the range of dipped beam, but don't really help you see any further when on dipped only.

gdaybruce

757 posts

231 months

Thursday 17th September 2009
quotequote all
My company 2007 Vauxhall Astra has the optional HID lights and these raise the level of the dipped beam as speed increases. They really do improve the situation on motorways, especially along the nearside where the pattern of the beam increases the range anyway. I've never been flashed by oncoming cars so must assume that they don't cause offence.

They also turn with the steering in relation to the car's speed - clever stuff but not quite so relevant to motorways!

Beyond Rational

Original Poster:

3,527 posts

221 months

Thursday 17th September 2009
quotequote all
Distant said:
Beyond Rational said:
Last night I was driving down a very dark section of motorway using dipped beams due to traffic on the other carriageway. The car has 'normal' headlights - nothing special but working properly and adjusted correctly.

The thing that occured to me, was that if there was a low, non reflective object blocking the road, at 70mph I very much doubt I would be able to see it, react and stop in the distance provided by the lights.

What would others do in this situation? (ignoring the merits of aftermarket HID lights for now)
I was having this very same conversation with myself during a boring journey last night. I concluded that it's just not possible to stick to the golden rule when driving at night on unlit roads. Use the clues you get from other vehicles lights and main beam as often as possible, even just for a second will help. Do what you can to minimise the risk and there isn't much more can be asked of you.

I remember a traffic cops type programme where some guy was hit and killed on an unlit section of dual carriageway. Terrible for the driver of the car that hit him, but the police said the driver couldn't have been expected to see him in the dark.

I've got factory fit HID lights and they're great at giving you more vision within the range of dipped beam, but don't really help you see any further when on dipped only.
That programme was on my mind, sparked off by seeing a piece of roadkill lying in my lane. I realised that I couldn't have stopped in time if it has been something more vital.

Beyond Rational

Original Poster:

3,527 posts

221 months

Thursday 17th September 2009
quotequote all
WhoseGeneration said:
Beyond Rational said:
Last night I was driving down a very dark section of motorway using dipped beams due to traffic on the other carriageway. The car has 'normal' headlights - nothing special but working properly and adjusted correctly.

The thing that occured to me, was that if there was a low, non reflective object blocking the road, at 70mph I very much doubt I would be able to see it, react and stop in the distance provided by the lights.

What would others do in this situation? (ignoring the merits of aftermarket HID lights for now)
Good question to raise and one I have thought about.
"We" are not good at seeing in the dark, unless there is no other light.
Try it, go for a walk out in the country, away from light pollution.
That's walking though, our "natural" pace.
So, we can now travel faster but needing artificial light to enable that.
The faster we want to go, the more illumination we need, why those who Rally at night, Road or Stage, bolt on as many lights as regulations allow.
Dipped though?, as you say, a real problem.
However, what I have observed is that, if the tarmac is grey, rather than black, it's easier to detect any objects in the carriageway.
Question to those who specify road surfaces?
I do think that car light designers should consider dipped beam performance more.
Or, perhaps we need some very low level, long range beams to illuminate the road surface?
I fear that the technological solution is either radar or non-visible spectrum illumination, with the logical conclusion of removing the human element.

loomx

327 posts

231 months

Thursday 17th September 2009
quotequote all
Distant said:
loomx said:
TBH I use main beams sometimes on motorways with oncoming traffic anyway.
I never had a problem with other people using main beam in on-comming traffic beams on motorways/dualcarridge ways. Yes you can tell thier lights are brighter, but they dont dazzel or blind you.
Please don't do this, your bright lights shining straight into the eyes of traffic coming the other way reduces their visibility. Yes, you'll be able to see more, but at the expense of everyone else seeing less?? It's not only inconvenient for other road users, its selfish and dangerous.
I only started doing it when there was quite a few people on the duel carridge way where I live did it, and I noticed that it didnt dazzel me. My car now has xenons so I dont really need to do it anymore because my highbeams arnt really much better. When I did it, If someone on the other side flashes me I flick them straight off and if there is a sweeping left hand bend i turn them off too. I never done it with alot of traffic on the other side of the road.

Iv never really though about it affecting other people vision with thier eyes adjusting to the light, because i didnt feel like it affected me too much. But I do get where you coming from. I wont be doing it anymore.

Edited by loomx on Thursday 17th September 17:39

r-kid

842 posts

193 months

Thursday 17th September 2009
quotequote all
Beyond Rational said:
Last night I was driving down a very dark section of motorway using dipped beams due to traffic on the other carriageway. The car has 'normal' headlights - nothing special but working properly and adjusted correctly.

The thing that occured to me, was that if there was a low, non reflective object blocking the road, at 70mph I very much doubt I would be able to see it, react and stop in the distance provided by the lights.

What would others do in this situation? (ignoring the merits of aftermarket HID lights for now)
I had exactly this situation back in 2004. Travelling down the motorway late at night & a big grey object appeared in my lights. No real chance to hit the brakes & I ended up runing over the thing. As it went under the car it ripped off my sump & broke the gearbox.
Was not a happy bunnyfrown

TheRoadWarrior

1,241 posts

184 months

Thursday 17th September 2009
quotequote all
r-kid said:
Beyond Rational said:
Last night I was driving down a very dark section of motorway using dipped beams due to traffic on the other carriageway. The car has 'normal' headlights - nothing special but working properly and adjusted correctly.

The thing that occured to me, was that if there was a low, non reflective object blocking the road, at 70mph I very much doubt I would be able to see it, react and stop in the distance provided by the lights.

What would others do in this situation? (ignoring the merits of aftermarket HID lights for now)
I had exactly this situation back in 2004. Travelling down the motorway late at night & a big grey object appeared in my lights. No real chance to hit the brakes & I ended up runing over the thing. As it went under the car it ripped off my sump & broke the gearbox.
Was not a happy bunnyfrown
So what was this 'big grey object' unlucky fella in a suit?

I too have considered this problem recently when coming back from the airport at ~2am on some unlit motorway sections. Whilst for oncoming drivers HIDs are a pain, I think its one part of a modern car that has really improved the safety aspect of driving in this situation.

Distant

2,362 posts

199 months

Thursday 17th September 2009
quotequote all
loomx said:
Distant said:
loomx said:
TBH I use main beams sometimes on motorways with oncoming traffic anyway.
I never had a problem with other people using main beam in on-comming traffic beams on motorways/dualcarridge ways. Yes you can tell thier lights are brighter, but they dont dazzel or blind you.
Please don't do this, your bright lights shining straight into the eyes of traffic coming the other way reduces their visibility. Yes, you'll be able to see more, but at the expense of everyone else seeing less?? It's not only inconvenient for other road users, its selfish and dangerous.
I only started doing it when there was quite a few people on the duel carridge way where I live did it, and I noticed that it didnt dazzel me. My car now has xenons so I dont really need to do it anymore because my highbeams arnt really much better. When I did it, If someone on the other side flashes me I flick them straight off and if there is a sweeping left hand bend i turn them off too. I never done it with alot of traffic on the other side of the road.

Iv never really though about it affecting other people vision with thier eyes adjusting to the light, because i didnt feel like it affected me too much. But I do get where you coming from. I wont be doing it anymore.

Edited by loomx on Thursday 17th September 17:39
Whats this? Someone on PH seeing the other side of the argument and adjusting their behaviour accordingly? Strangest thing I've ever seen! Good man for bucking the trend. smile

Very nice Audi too matelick