Freeway speed-flow relationships under rain and congested conditions
Executive Committee for the Interdisciplinary Program in Transportation
Doctor of Philosophy
Daniel, Janice Rhoda
Chien, I-Jy Steven
Bladikas, Athanassios K.
Rain adjustment factor
Adverse weather conditions
A procedure to account for the impact of rain and congested conditions on the average speed estimates is provided in this study. Although the Highway Capacity Manual (HCM) provides some discussion on the impact of adverse weather on speed-flow relationships, these impacts are not quantified. Using data collected under rain and congested conditions, a procedure for estimating the average speed under these conditions is provided, which is an improvement over the existing HCM (2000) procedures. Using the speed-flow relationships provided in the HCM (2000) for basic freeway segments as a starting point, new numerical relationships suitable for New Jersey roadways are derived. The new speed-flow relationships can be used to estimate operating speed and level of service (LOS) for New Jersey roadways under rain and congested conditions. The findings are as follows:
njit-etd2009-048 (167 pages ~ 9,756 KB pdf)
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Created September 13, 2010