Development and Evaluation of Lane-By-Lane Gap-Out Based Actuated Traffic Signal Control
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2012-09-01
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Edition:Final report.
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Abstract:Actuated traffic signal controls at isolated intersections largely benefit from gap-out and phase skip features as they allow
unused green times to be re-allocated to those movements need them. A few studies indicated that lane-by-lane gap-out
should be implemented for multi-lane approaches instead of traditional combined single channel gap-out. While the lane-bylane
gap-out is logically better than the combined channel gap-out, no studies have shown the delay benefits under the
optimized green splits and gap-out times.
This research developed a lane-by-lane gap-out-based actuated signal control optimization method and evaluated its
performance using four demand cases covering volume-to-capacity ratios between 0.4 and 1.3. A simulation-based study
indicated that the lane-by-lane gap-out outperformed the combined single channel gap-out for all these cases. It was found
that over 12% total delay savings were observed for high volume-to-capacity ratio cases.
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