DSIR 12/181a - Revision history

Chris5156: Add new header

2009-11-29T20:29:03Z

Add new header

← Older revision		Revision as of 20:29, 29 November 2009
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	[[Category:Subseries DSIR 12]]		[[Category:Subseries DSIR 12]][[Category:Roundabouts]]
	[[Category:Roundabouts]]		{{Header
	{\|		\| title = Effect of installing signals at the Western Avenue/Greenford Road roundabout
	~~\|'''Location'''~~		\| daterange = 1960
	~~\|[[National Archives]]~~		\| nacatref = 574828
	\|-		\| series = DSIR
	~~\|'''Title'''~~		\| subseries = 12
	\|Effect of installing signals at the Western Avenue/Greenford Road roundabout		}}
	\|-
	~~\|'''Date range'''~~
	\|1960
	\|-
	\|~~'''Catalogue'''~~
	\|~~[http://www.nationalarchives.gov.uk/catalogue/displaycataloguedetails.asp?CATID=-574828&CATLN~~=~~7 See entry]~~
	\|}

	==Context==		==Context==

Chris5156: Add to Category:Roundabouts

2009-11-25T17:49:57Z

Add to Category:Roundabouts

← Older revision		Revision as of 17:49, 25 November 2009
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	[[Category:Subseries DSIR 12]]		[[Category:Subseries DSIR 12]]
			[[Category:Roundabouts]]
	{\|		{\|
	\|'''Location'''		\|'''Location'''

Chris5156 at 11:09, 30 December 2008

2008-12-30T11:09:30Z

← Older revision		Revision as of 11:09, 30 December 2008
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	==Contents of note==		==Contents of note==
	* Photographs of the Greenford Road Roundabout signalisation scheme.		* Photographs of the Greenford Road Roundabout signalisation scheme.

			==Related files==
			:'''[[DSIR 12/181b]]''' Effect of installing signals on approaches to roundabout at New York Road Circus, Leeds (1960)

	==People with camera copies==		==People with camera copies==
	[[User:Chris5156\|Chris Marshall]] has a partial copy, including all photographs.		[[User:Chris5156\|Chris Marshall]] has a partial copy, including all photographs.
			__NOTOC__

Chris5156: New page: Category:Subseries DSIR 12 {| |'''Location''' |National Archives |- |'''Title''' |Effect of installing signals at the Western Avenue/Greenford Road roundabout |- |'''Date range''' ...

2008-12-30T11:08:37Z

New page: Category:Subseries DSIR 12 {| |'''Location''' |National Archives |- |'''Title''' |Effect of installing signals at the Western Avenue/Greenford Road roundabout |- |'''Date range''' ...

New page

[[Category:Subseries DSIR 12]]
{|
|'''Location'''
|[[National Archives]]
|-
|'''Title'''
|Effect of installing signals at the Western Avenue/Greenford Road roundabout
|-
|'''Date range'''
|1960
|-
|'''Catalogue'''
|[http://www.nationalarchives.gov.uk/catalogue/displaycataloguedetails.asp?CATID=-574828&CATLN=7 See entry]
|}

==Context==
In the early 1960s roundabouts were something of a problem - clearly a promising idea in traffic control, and already found in great numbers around the country, but prone to locking up with the increasing post-war traffic levels. Experiments were carried out to find ways of making them more reliable under heavier traffic pressure.

The eventual solution, which was already being trialled at this time, was the now-familiar priority rule where entering traffic must give way to circulating traffic. This experiment carried out by the RRL came at the problem a different way, and was the earliest known instance of an existing roundabout being signalised.

The traffic signals were a fairly crude set-up, with traffic on the A40 Western Avenue being halted about fifty yards back from the Greenford Road roundabout. The experiment was closer to the modern idea of ramp metering than true signalisation, and its intention was to regulate the amount of A40 traffic that could reach the roundabout, preventing it from being overwhelmed.

The results of the experiment were not brilliant and the equipment was dismantled when the experiment ended.

==Contents of note==
* Photographs of the Greenford Road Roundabout signalisation scheme.

==People with camera copies==
[[User:Chris5156|Chris Marshall]] has a partial copy, including all photographs.