United States Department of Transportation
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Effectiveness of Two-stage Turn Queue Boxes in Massachusetts: A Comparison with Bike Boxes
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2024-08-01
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[PDF-2.73 MB]
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Edition:Final Report [August 2024][Sept. 2022 - August 2024]
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Abstract:Two-stage turn queue boxes (TSTQBs) are designated for bicyclist spaces that are installed to improve the safety of left turns at intersections. This project studied the effectiveness of TSTQBs in Massachusetts by investigating left-turning bicyclist behavior at TSTQBs and correlating it with design elements. A comprehensive inventory of 88 TSTQBs was developed and a field study that allowed for capturing left-turning bicyclist behavior at six intersections in Massachusetts, including 14 TSTQB and 6 control (no TSTQB) approaches was performed. The results indicate a much lower TSTQB bicyclist utilization rate compared to other studies and no statistically significant difference in utilization at approaches that also feature bike boxes. The findings also suggest the need to install TSTQBs when crosswalk usage for bicyclists’ left-turning is high, and when approaches lack protected left-turn phasing or dedicated left-turn lanes. Future work should focus on understanding bicyclists’ and motorists’ perceptions, comprehension, and familiarity with TSTQBs as well as the impact of TSTQB dimensions and bicyclists demand to further inform design recommendations.
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