Issues with traffic signals

Show simple item record Sampson, J.D. Van As, S.C. 2008-05-30T10:50:20Z 2008-05-30T10:50:20Z 2004-07
dc.description This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: URL: en
dc.description.abstract Paper presented at the 23rd Annual Southern African Transport Conference 12 - 15 July 2004 "Getting recognition for the importance of transport", CSIR International Convention Centre, Pretoria, South Africa. In 2000, the National Department of Transport commissioned the redrafting of Volume 3, Traffic Signal Design and related chapters of the Road Traffic Signs Manual. The first draft was completed in April 2001 and has been in use since that date. Various changes to the design of traffic signals appear in this draft, requiring changes to the National Road Traffic Regulations. The changes to the Regulations were promulgated in September 2003. During the preparation of the document a number of issues arose that were not dealt with, mainly because the research necessary had not been undertaken. Most of the issues relate to the configuration of signal faces, and include amongst others the following: �� Traffic operations during right-turn phases are often inefficient because drivers are not able to anticipate the flashing green arrow and sometimes do not see it. �� The lagging right-turn phase has several advantages when compared with the leading right-turn phase, but its effectiveness is currently being limited due to the signaling system. There is a need to consider changes to the system. �� A protected-only right-turn phase is one in which the right-turn movement is allowed only when a green flashing arrow signal is indicated. A new signal face and road sign is now provided for this in the regulations. Experience with the signal face, however, has shown that while it serves this purpose, it does have a number of disadvantages. An alternative approach may be required and is discussed in the paper. This paper also addresses some alternative signaling methods. It is proposed that a research project be commissioned to properly investigate and evaluate both existing and alternative traffic signal systems. en
dc.format.extent 245794 bytes
dc.format.mimetype application/pdf
dc.identifier.citation Sampson, JD & Van As, SC 2004,'Issues with traffic signals' , Paper presented to the 23rd Annual Southern African Transport Conference, South Africa, 12 - 15 July. en
dc.identifier.isbn 1920017232
dc.language eng
dc.language.iso en en
dc.publisher SATC en
dc.relation.ispartof SATC 2004
dc.rights University of Pretoria en
dc.subject Transport en
dc.subject.lcsh Transport -- South Africa -- Congresses
dc.subject.lcsh Transport services -- South Africa -- Congresses
dc.subject.lcsh Transport systems -- South Africa -- Congresses
dc.title Issues with traffic signals en
dc.type Event en

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