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Subject:

Whatever happened to road hierarchy?

From:

Stephen Marshall <[log in to unmask]>

Reply-To:

Stephen Marshall <[log in to unmask]>

Date:

Thu, 4 Jun 2009 11:44:26 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (67 lines)

Dear all

Following Manual for Streets and other local streets-oriented design 
guidance, where does this leave road hierarchy?

By road hierarchy I mean the conventional set of road types such as 
Primary Distributor, District Distributor, Local Distributor, Access Road.

I am asking this list because it can be difficult to track how this 
is actually used, through published documents, since a document may 
not mention hierarchy explicitly, but it may still be applied in some 
way. Or, even if mentioned in a document, it is not always clear how 
practitioners actually use it, when designing a road network.

I am interested in hearing of any cases where:
(i) Road hierarchy is still used - even if not expressed explicitly 
in documents - if so, how is it applied?
(ii) Road hierarchy has 'evolved' where there may be new road types 
added over and above the basic set - if so, what are they?
(iii) There is more than one set of guidance coexisting (e.g. 
conventional engineering guidance + urban design guidance) - if so, 
is the relationship between the two clear and consistent, and how are 
they actually applied in practice?
(iv) Urban design style street types are used, but are expected 
(implicitly or explicitly) to correspond to levels in the 
conventional hierarchy (e.g. a Boulevard may be equate with a 
District  Distributor; a Mews may be an Access Road) - if so, how 
does this work?
(v) Road hierarchy is applied to the "higher levels" (e.g. trunk 
roads, county roads) while the lower level use a range of labels 
(e.g. access street, high street, etc.) - if so, how is the high/low 
level split decided?
(vi) Road hierarchy is no longer used - if so, what if anything has 
replaced it?

I would be interested in hearing of any examples of these instances, 
and how they work, especially in the UK (e.g. local authority 
practice), but also non-UK examples where the equivalent of road 
hierarchy applies.

I will let the list know of any interesting results coming out of 
this. This is part of an investigation into better integration / 
articulation of road / street hierarchy / layout principles. This 
research is part of the EPSRC funded project SOLUTIONS 
(Sustainability Of Land Use and Transport in Outer NEighbourhoodS).

best wishes

Stephen


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Dr Stephen Marshall, Senior Lecturer, Bartlett School of Planning, 
University College London
Wates House, 22 Gordon Street, London WC1H 0QB, Tel +44 20 7679 4884, 
Fax +44 20 7679 7502

New journal: Urban Design and Planning www.urbandesignandplanning.com
New book: Cities Design & Evolution (Routledge, 2009)






  

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