This issue contains ten papers concerned with traffic signal systems. Specific topics addressed include: cycle length; optimizing traffic signal timing; assessing agency-wide signal management objectives; estimating queue lengths at signalized intersections; and dynamic lane assignment at isolated signalized intersections. Additional topics include: exit lanes for left-turn traffic; advance detector configuration for option zone protection at high-speed intersections; the effect of detector delays on right-turn-on-red traffic; controller upgrade decision making; and coordinating signal timings for intersection approach with presignals.
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