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Predicting Lane Utilization at Signalized Intersections in Advance of Arterial Lane Drops
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2022-01-01
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[PDF-966.99 KB]
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Edition:Final, Sept 2020 to December 2021
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Abstract:When a through travel lane on an arterial road is dropped shortly beyond a signalized intersection, there can be a negative impact on capacity as drivers try to preemptively merge before the intersection. This research seeks to increase understanding of the factors that impact the utilization of discontinued (short) lanes and develop standards for design of lane drops to improve lane utilization. A total of 25 study locations throughout Utah were selected for analysis, and video recordings of the approaches were used to determine lane-by-lane counts during the PM peak period. Using the volume counts, the utilization rate of the short lane was calculated for each cycle and 15-minute period. A statistical analysis was used to predict the lane utilization rate based on several variables. Length until lane drop was significant with a positive influence on lane utilization while the natural log of through volume (in vehicles per hour), the presence of a trap lane, and speed limit were all significant with a negative influence on lane utilization. Use of the selected regression model should be used with understanding of the limitations of the dataset, specifically that the data was skewed toward lane drops with short lanes of 300 feet or shorter and approaches with less than 1,000 through vehicles per hour. Additionally, while the findings do not definitively indicate a preferable short lane length for acceptable lane utilization, it is apparent that it exceeds the typical lengths represented throughout Utah.
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