HGV third lane use, what about dual carriageways? |
HGV third lane use, what about dual carriageways? |
Thu, 16 Jan 2020 - 18:47
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#1
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Member Group: Members Posts: 1,535 Joined: 16 Jan 2009 From: Up north Member No.: 25,505 |
HGV, can use all lanes on a multi lane single carriage way.
HGV can use both lanes on a dual carriage way. HGV are unable to use third lane on a motorway. What about a three lane dual carriageway? Just south of Newcastle there is a three lane section of the A1 which has not been upgraded or designated as motorway. Can an HGV therefore use that third lane? -------------------- Bridges burnt, Rubicons crossed. Parthian shots delivered, but always with style
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Thu, 16 Jan 2020 - 18:47
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Wed, 22 Jan 2020 - 20:44
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#21
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Member Group: Members Posts: 972 Joined: 9 Oct 2016 Member No.: 87,665 |
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Wed, 22 Jan 2020 - 21:54
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#22
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Member Group: Members Posts: 7,235 Joined: 5 Jan 2007 From: England Member No.: 9,919 |
Nope. Flow is the number of vehicle passing a given point in a set time ie per hour. If traffic speed is greater more vhicles will pass that point in that hour. If traffic is travelling at 10mph fewer vehicles can pass that point than if was travelling at 70mph
Are you.mistaking flow for volume? This post has been edited by mickR: Wed, 22 Jan 2020 - 21:55 |
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Thu, 23 Jan 2020 - 06:50
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#23
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Member Group: Members Posts: 3,768 Joined: 17 Mar 2013 Member No.: 60,602 |
The problem with HGVs occupying all the lanes is not just their speed but their width, and leaving room for motorcycles to filter between lanes 2 and 3, or even lane 1 and 2 if they are both occupied by wide vehicles. I don't think that leaving room for queue jumping motorcycles will ever be a consideration in highway design or management. -------------------- British Parking Association Ltd Code of Practice(Appendix C contains Schedule 4 of POFA 2012 ) & can be found here http://www.britishparking.co.uk/Code-of-Pr...ance-monitoring
DfT Guidance on Section 56 and Schedule 4 of POFA 2012 https://www.gov.uk/government/uploads/syste...ing-charges.pdf Damning OFT advice on levels of parking charges that was ignored by the BPA Ltd Reference Request Number: IAT/FOIA/135010 – 12 October 2012 |
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Thu, 23 Jan 2020 - 08:35
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#24
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Member Group: Members Posts: 972 Joined: 9 Oct 2016 Member No.: 87,665 |
Nope. Flow is the number of vehicle passing a given point in a set time ie per hour. If traffic speed is greater more vhicles will pass that point in that hour. If traffic is travelling at 10mph fewer vehicles can pass that point than if was travelling at 70mph Are you.mistaking flow for volume? Ok, if vehicles are travelling faster, they have to leave greater distances between them, meaning that there are actually less vehicles passing a given point per hour, despite those individual vehicles moving at a higher speed. If one car passes that given point during the hour, but does so at 300mph, is that high traffic flow? No. Here is a typical graph showing speed vs flow, and how flow does not simply increase with speed: |
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Thu, 23 Jan 2020 - 10:40
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#25
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Member Group: Members Posts: 7,235 Joined: 5 Jan 2007 From: England Member No.: 9,919 |
So you are now introducing the third variable of density. You cannot asses flow without density. Your analogy of one car at 300mph is im affraid nonsense. Your link to hamilton one of many studies, others will not agree.
Anyway we should agree to differ our opinions i think. |
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Thu, 23 Jan 2020 - 13:43
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#26
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Member Group: Members Posts: 972 Joined: 9 Oct 2016 Member No.: 87,665 |
So you are now introducing the third variable of density. You cannot asses flow without density. Your analogy of one car at 300mph is im affraid nonsense. Your link to hamilton one of many studies, others will not agree. Anyway we should agree to differ our opinions i think. If you can't assess flow without density, and we've been talking about flow all this time, I'm not sure how you can consider density as a new variable... That's like discussing velocity for a few posts, then getting the hump because someone has started bringing 'distance' into the conversation... Find me a study that doesn't agree there is an optimum speed for maximum traffic flow (i.e. a speed beyond which the number of vehicles per hour begins to decrease). There will, I'm sure, be lots of discussion about what that speed is, but they will all agree the optimum speed exists. And I'm also sure it will be below the speed limit for HGVs. |
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Thu, 23 Jan 2020 - 16:46
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#27
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Member Group: Members Posts: 7,235 Joined: 5 Jan 2007 From: England Member No.: 9,919 |
Your analogy, one car, 300mph. Not mine.
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Thu, 23 Jan 2020 - 17:20
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#28
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Member Group: Members Posts: 972 Joined: 9 Oct 2016 Member No.: 87,665 |
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Thu, 23 Jan 2020 - 21:56
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#29
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Member Group: Members Posts: 7,235 Joined: 5 Jan 2007 From: England Member No.: 9,919 |
read your own post
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Thu, 23 Jan 2020 - 22:38
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#30
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Member Group: Members Posts: 33,610 Joined: 2 Apr 2008 From: Not in the UK Member No.: 18,483 |
Zzzzzzzzzz.
-------------------- Moderator
Any comments made do not constitute legal advice and should not be relied upon. No lawyer/client relationship should be assumed nor should any duty of care be owed. |
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Thu, 23 Jan 2020 - 23:12
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#31
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Member Group: Members Posts: 972 Joined: 9 Oct 2016 Member No.: 87,665 |
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Thu, 23 Jan 2020 - 23:29
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#32
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Member Group: Members Posts: 7,235 Joined: 5 Jan 2007 From: England Member No.: 9,919 |
Did you see the moderators post above, it wasca hint incase you didnt notice.
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Fri, 24 Jan 2020 - 08:20
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#33
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Member Group: Members Posts: 972 Joined: 9 Oct 2016 Member No.: 87,665 |
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Fri, 24 Jan 2020 - 12:49
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#34
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Member Group: Members Posts: 7,235 Joined: 5 Jan 2007 From: England Member No.: 9,919 |
I rest my case SP.
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Fri, 24 Jan 2020 - 13:16
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#35
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Webmaster Group: Root Admin Posts: 8,205 Joined: 30 Mar 2003 From: Wokingham, UK Member No.: 2 |
My take on SP's comment was that it was less of a hint than expressing the view (which I imagine most people reading this would share) that this "yes it is... no it isn't..." exchange is boring as hell.
-------------------- Regards,
Fredd __________________________________________________________________________
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Fri, 24 Jan 2020 - 13:25
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#36
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Member Group: Members Posts: 33,610 Joined: 2 Apr 2008 From: Not in the UK Member No.: 18,483 |
My take on SP's comment was that it was less of a hint than expressing the view (which I imagine most people reading this would share) that this "yes it is... no it isn't..." exchange is boring as hell. ‘Zactly. -------------------- Moderator
Any comments made do not constitute legal advice and should not be relied upon. No lawyer/client relationship should be assumed nor should any duty of care be owed. |
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Fri, 24 Jan 2020 - 16:28
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#37
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Member Group: Members Posts: 7,235 Joined: 5 Jan 2007 From: England Member No.: 9,919 |
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