Masters Theses


Jimmy Rathod

Keywords and Phrases

Protected permissive phasing


"At a signalized intersection, left-turners are the important parameter in determining the capacity and level of service of the intersection. Therefore, care should be taken for the efficient flow of the left-turning traffic. The use of protected/permitted left-turn signal phasing increases the efficiency of the intersection and reduces the delay to the left-turning traffic. However, this phasing operates well when the opposing through traffic is low-to-medium. As the opposing traffic increases, the permissive phase of the protected/permissive phasing will be unused and the left-turn can only be made at the end of permissive green. A review of literature gives a fixed number for opposing through traffic above which the permissive phase will be unused i.e., no acceptable gap for the left-turning traffic. This is not always true. It is possible that there are no gaps for the left- turning traffic at opposing volume less than what the literature suggests. An equation was developed using the queue clearance equation of Highway Capacity Model (HCM) 2000 to find the opposing volume at which the permissive phase of protected/permissive phasing will be unused. The results obtained from this equation are verified in SimTraffic 5. The opposing volume changes with site conditions and it was found that at the volume obtained from this equation, the permissive phase was unused and left-turns could be made only at the end of permissive green (i.e., sneakers).

The solution presented in this thesis can be very useful for a traffic engineer to decide whether it is advantageous to provide protected/permissive phasing at a particular intersection."--Abstract, page iii.


Qureshi, Mohammad

Committee Member(s)

Spring, Gary
Gadbury, Gary L.


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


University of Missouri--Rolla

Publication Date

Summer 2004


viii, 44 pages

Note about bibliography

Includes bibliographical references (pages 42-43).


© 2004 Jimmy Rathod, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Left-turn lanes
Electronic traffic controls -- Planning
Traffic signs and signals -- Evaluation
Traffic flow -- Evaluation
Traffic engineering

Thesis Number

T 8587

Print OCLC #


Link to Catalog Record

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