United States Department of Transportation
i
Prevailing Saturation Flow Rate for Lane Groups in the District of Columbia
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2014-12-18
[PDF-1.24 MB]
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Edition:Final Report, March 2013 – December 2014
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Abstract:The District of Columbia Department of Transportation seeks to determine its local base saturation flow rate (SFR), which will be used in the conduct of level of service analyses for signalized intersections. The first step in the process of determining the local base SFR, in accordance with the 2010 Highway Capacity Manual (HCM), is to determine the prevailing SFR for selected lane groups. This study focused on determining the prevailing SFR for the through (T), shared right and through (RT), shared left and through (LT) and exclusive left turn (L) lane groups. The study determined the prevailing SFR for the mentioned lane groups based on data collected at 67 intersections for the morning and evening peak periods. The prevailing SFR was computed based on the average headway data obtained from the field at the selected intersections. An overall mean prevailing SFR of 1,559 vehicles per hour per lane (vphpl), 1,461 vphpl, 1,526 vphpl and 1,477 vphpl was determined for the T, RT, LT, and L lane groups. These average prevailing SFRs can be used to determine the local base SFR for the city based on the procedures of HCM. This will involve the determination of the adjusted SFRs for the selected lane groups after which the local base SFR can be computed using the formula presented in this report.
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