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Multivariable Analysis of Roundabout Versus Traffic Signals – A Case Study In Alberta


Alberta Transportation policy states that roundabouts shall be considered as an alternative option for intersection designs where, in the judgment of the department, a greater degree of traffic control than a two-way stop is required on a paved roadway. This paper presents a multivariate evaluation between two proposed alternative treatments, a roundabout and a traffic signal, for the future intersection of Lochend Road (Highway 766) & Highway 1A, in the County of Rocky View, Alberta. At the time of the study the intersection was two-way stop controlled. A multivariate evaluation process was used to compare both alternatives. A total of 13 evaluation criteria in three categories were applied to compare both alternative configurations and to select a recommended plan. The categories identified were cost, safety and operations. At the end, each category reached a numerical weighted score evaluation for each option; higher score indicates a more favorable evaluation. Scores are relative rather than absolute. In this study, the results showed that a signalized intersection is favored over the roundabout option; and hence was the recommended option. The study offered a systematic and credible method of evaluation for consideration in the final decision making process.

Conference Paper Details

Session title:
Jorge Arango
Bosco Tong
Geometric design