United States Department of Transportation
i
Safety Evaluation of Alternatives for Installing Pedestrian Signals Under Side Street Green Operation
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2023-06-14
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[PDF-1.09 MB]
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Edition:Final Report, 05/01/2021-06/30/2023
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Abstract:The objective of this project was to carry out a safety evaluation of conversion of intersections owned by CTDOT operating under side street green pedestrian phasing to concurrent pedestrian phasing. Side street green phasing means that pedestrians cross the main road during the minor road green phase, and there is no special pedestrian phasing or signal faces. With concurrent phasing, pedestrians continue to cross the major road during the minor road phase, but they are given “Walk” and “Don’t Walk” indications. The safety evaluation included observation of and analysis of differences in the distribution of pedestrian-vehicle interaction, severity, and compliance of pedestrians with signal operation for both treatment and control intersections. Intersections operating under side street green signal operation were formed into cohort groups with similar characteristics such as crossing distance, traffic volume, and types of pedestrian amenities. An intersection with similar characteristics operating under exclusive pedestrian phasing, in which pedestrians are provided with their own phase during which all motorized traffic is stopped, was added to each cohort group for comparison. During a before period, interactions between pedestrians and vehicles were observed at all intersections, along with how long each pedestrian waited before crossing the road and how long it took the pedestrian to cross the road. Between the before and after periods, one or two side street green intersections in each cohort group were converted to concurrent phasing, half with auxiliary signage alerting pedestrians and motorists that motorists and pedestrians would travel during the same phase and that motorists should yield to pedestrians. After the conversion was complete, the same observations were made again in an after period at all study locations. Weighted binary regression was used to predict the probability of any given pedestrian experiencing a conflict with a motor vehicle, defined according to the Swedish Conflict Technique. Intersections operating with either concurrent or exclusive phasing reduce the probability of a conflict almost 50% compared to side street green intersections. Binary regression was also used to predict the probability of a pedestrian being compliant with the signal operation. Intersections with concurrent operation with auxiliary signage showed almost 50% higher compliance compared with concurrent operation without auxiliary signage and exclusive phase intersections. The findings suggest that it would be beneficial to convert intersections with side street green or exclusive phase operation to concurrent phasing, but that the auxiliary signage is helpful to ensure pedestrian compliance.
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