1987•Unpublished venueRequires access
DESIGN AND OPERATION OF SIGNALIZED INTERSECTIONS IN ILLINOIS. FINAL REPORT.
Paul P. Jovanis, Panos D. Prevedouros, N Rophail
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Abstract
The purpose of this research was to calibrate the new 1985 Highway Capacity Manual using signalized intersections near Chicago and to derive platoon progression factors. Channelized intersections with turn lanes and full-actuated traffic signal control were studied. Capacity analyses were calculated for the intersections using the 1985 Highway Capacity Manual; then traffic volumes were measured in the field for comparison. Significant differences were found in 3 areas: (1) Through-lane saturation flow rates (measured traffic volumes) were 11% greater than calculated by the 1985 Highway Capacity Manual; (2) Time periods for accurate traffic volume measurements varied from 33% to 133% of the 15 minute interval recommended by the 1985 Highway Capacity Manual; and (3) Measured intersection delay was less than calculated and less dependent on platoon arrival types. Recommended platoon progression factors are significantly lower than 1985 Highway Capacity Manual values.