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 Post subject: Re: Overtaking crashes
PostPosted: Thu Dec 14, 2006 13:43 
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greenv8s wrote:
Is the road wide enough to allow three lanes? It looks to me as if it may be. If so, my suggestion would be to put two lanes on one side and one on the other. It looks as if there is a hill, in which case I'd be inclined to put the two lanes on the uphill side.

If this stretch of road is where I think it is I suspect that the second uphill lane was removed for a good reason. The roundabout at the top of the hill is a problem in the tourist season and regularly gridlocks. Reducing the number of uphill lanes to one displaces the bottleneck to the start, rather than the end, of this stretch of road.

FWIW, the same strategy is implemented in several places in Devon and Cornwall for the tourist season and claims have been made for significant increase in traffic flow.

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 Post subject: Re: Overtaking crashes
PostPosted: Thu Dec 14, 2006 13:52 
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willcove wrote:
greenv8s wrote:
Is the road wide enough to allow three lanes? It looks to me as if it may be. If so, my suggestion would be to put two lanes on one side and one on the other. It looks as if there is a hill, in which case I'd be inclined to put the two lanes on the uphill side.

If this stretch of road is where I think it is I suspect that the second uphill lane was removed for a good reason. The roundabout at the top of the hill is a problem in the tourist season and regularly gridlocks. Reducing the number of uphill lanes to one displaces the bottleneck to the start, rather than the end, of this stretch of road.

FWIW, the same strategy is implemented in several places in Devon and Cornwall for the tourist season and claims have been made for significant increase in traffic flow.


Then perhaps they could have made the double lane away from the bottleneck?

[Driving my campervan I crave downhill double lanes because loss of speed due to climbing often prevents me overtaking slower vehicles on uphill sections.]

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 Post subject: Re: Overtaking crashes
PostPosted: Thu Dec 14, 2006 13:53 
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Grumpy Old Biker wrote:
Hang on a minute - this sounds a bit interesting!

Are you saying that there are legally inforceable road markings which are not in the public domain, ie not in the Highway Code?

Or am I missing something here?


There's loads of stuff missing from the HC. For instance, something I recently learned over on 'the dark side', that cycleways are only designed for use by cyclists travelling at up to 12mph. (Apparently its in the DfT guidelines).

Could the answer be something along the lines of the M6 chevrons? Give drivers an idea of just how far they actually do need to be able to see before they can safely overtake? Coupled with some simple signage along the lines of 'can you REALLY see far enough' or something like that?

Road markings alone don't hold much regard here I'm affraid. I can think of several places that are marked with double whites where overtaking is easily possible and other places marked with single dashed whites where there's not a chance in hell of a safe overtake.

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 Post subject: Re: Overtaking crashes
PostPosted: Thu Dec 14, 2006 14:32 
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Sixy_the_red wrote:
Road markings alone don't hold much regard here I'm affraid. I can think of several places that are marked with double whites where overtaking is easily possible and other places marked with single dashed whites where there's not a chance in hell of a safe overtake.


This is even more true for motorcycles. Loads of places I could very safely overtake but can't because of the white paint. The line positioning obviously caters for the worst case scenario.

And as you say, broken lines are often suicidally placed. Sometimes I wonder if the positioning is decided by the guys in the yellow lorry holding the paint brushes.

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 Post subject: Re: Overtaking crashes
PostPosted: Thu Dec 14, 2006 14:35 
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Grumpy Old Biker wrote:
Sixy_the_red wrote:
Road markings alone don't hold much regard here I'm affraid. I can think of several places that are marked with double whites where overtaking is easily possible and other places marked with single dashed whites where there's not a chance in hell of a safe overtake.


This is even more true for motorcycles. Loads of places I could very safely overtake but can't because of the white paint. The line positioning obviously caters for the worst case scenario.

And as you say, broken lines are often suicidally placed. Sometimes I wonder if the positioning is decided by the guys in the yellow lorry holding the paint brushes.


It really wouldn't surprise me!

Overtaking on any decent bike isn't really that much of a challenge though, is it? :lol:

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 Post subject: Re: Overtaking crashes
PostPosted: Thu Dec 14, 2006 14:54 
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Sixy_the_red wrote:
Overtaking on any decent bike isn't really that much of a challenge though, is it? :lol:


Not entirely sure I agree with that - but I know what you mean.

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 Post subject: Re: Overtaking crashes
PostPosted: Thu Dec 14, 2006 16:04 
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Sixy_the_red wrote:
Could the answer be something along the lines of the M6 chevrons? Give drivers an idea of just how far they actually do need to be able to see before they can safely overtake?


don't you need a different set of chevrons depending what speed the overtakee is going at ? !


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 Post subject: Re: Overtaking crashes
PostPosted: Thu Dec 14, 2006 16:21 
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ed_m wrote:
Sixy_the_red wrote:
Could the answer be something along the lines of the M6 chevrons? Give drivers an idea of just how far they actually do need to be able to see before they can safely overtake?


don't you need a different set of chevrons depending what speed the overtakee is going at ? !


Yeah, I was thinking more along the lines of using markings to aid judgement of visible distance.

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 Post subject: Re: Overtaking crashes
PostPosted: Thu Dec 14, 2006 21:55 
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Sixy_the_red wrote:
ed_m wrote:
Sixy_the_red wrote:
Could the answer be something along the lines of the M6 chevrons? Give drivers an idea of just how far they actually do need to be able to see before they can safely overtake?


don't you need a different set of chevrons depending what speed the overtakee is going at ? !


Yeah, I was thinking more along the lines of using markings to aid judgement of visible distance.


what you really need marked i suppose is time.... which of course depends on speed but say.. you can see 5 chevrons clear you know you've got 10seconds to make the overtake (or similar)

or perhaps the arrows & center lines need more graduation to give you more of a countdown (to disaster :wink: )


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