Citation

Najafi FT. Transp. Res. Rec. 1988; 1160: 78-89.

Copyright

(Copyright © 1988, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

A simple and practical procedure involving operational, economic, and safety impact considerations is developed for evaluating improvements to isolated signalized intersections. The result is a step-by-step technique that allows planners and engineers to compare the benefits and costs of improvements to isolated signalized intersections. The procedure (or sketch planning process) was synthesized from the literature and from a survey of current practices in Florida at city, county, and state levels. It incorporates benefit/cost techniques and the Signal Operations Analysis Package (SOAP), thus improving on previous methods. Factors that were incorporated into the process include right-of-way needs, fuel consumption, benefit/cost ratio, staged improvement options, and safety considerations. The average delay and level of service attributable to alternative staged improvement plans during the planning horizon is exhibited graphically in a case study, illustrating the adaptability of the system in achieving an acceptable level of service at a specified future date. The case study shows that the sketch planning process developed through this research can be applied to almost any urban isolated signalized intersection, providing that accurate input data are available and that practical results can be generated.

Record URL:
http://onlinepubs.trb.org/Onlinepubs/trr/1988/1160/1160-010.pdf

Language: en

Keywords

Traffic Signs, Signals and Markings; Roads and Streets--Intersections; Street Traffic Control; Urban Planning--Transportation