Intersections are crash-prone locations due to the presence of conflicting vehicular movements. However, safety is not included in the intersection performance measure of level of service (LOS) for signalized intersections according to the current Highway Capacity Manual. The research presents the concept of safety level of service (SLOS) and develops model of SLOS for signalized intersections based upon vehicle conflicts, intersection geometrics, signal phasing, pavement markings, signage, pavement condition and ambient lighting. The average control delay of LOS is combined with risk index of SLOS to develop the delay and risk index for the improved LOS performance measure accounted for safety. In light of current LOS criteria and distribution of risk index values, the improved LOS criteria are defined for signalized intersections.
Safety Based Signalized Intersection Level of Service
First International Symposium on Transportation and Development Innovative Best Practices ; 2008 ; Beijing, China
2008-04-04
Conference paper
Electronic Resource
English
Safety Based Signalized Intersection Level of Service
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