Iteris is proud to join the Florida LTAP Center in presenting a three-part webinar series on Traffic Signal Timing 101 – The Basics of Local Intersection Control. Presented by Iteris' Peter Yauch and John Albeck, the series is divided into three two-hour webinars designed to provide participants with an understanding of the operation of local intersection signal controllers, and the various timing parameters needed for the safe and efficient operation of the intersection. This series addresses local intersection control operations; a subsequent series will cover the basics of detection, preemption and priority, and signal coordination.
Learning Objectives
- Understand basic traffic flow characteristics and roadway capacities as they relate to signalized intersections.
- Understand intersection phasing needs and the timing interval components of each phase.
- Understand controller ring structure.
- Recognize the different types of signal controllers and how they can be used for intersection operations.
- Understand the ring-based structure of controllers and how signal phase sequences can impact operations.
Each session will award two professional development hours (PDHs) each. A total of six PDHs can be earned for fully attending all three sessions.
Part 1 of 3 – Basic Vehicular Timing Considerations and Signal Phasing/Intervals (2/3/2021)
In this first session, we will introduce the course objectives, goals, and glossary of terms. The following topics will be covered: Traffic Flow Theory, Greenshields Equation for Discharge, Saturation Flow Rate, Lane Capacity, Intersection Capacity, Through Movements, Left Turn Movements (Protected, Permitted, Protected/Permitted), Vehicular Intervals, and Pedestrian Intervals.
Part 2 of 3 – Phasing Sequences and Signal Controllers (2/10/2021)
In this second session, we will cover the following topics: Through Movements, Left Turn Movements, Left Turn Trap, Split Phasing, Overlaps, Pedestrian Movements, Leading Pedestrian Intervals, Fixed Time Controllers, Actuated Controllers, Controller Standards, and Ring Structure.
Part 3 of 3 – Phase Intervals Safety and Efficiency (2/17/2021)
In this third session, we will cover the following topics: Safety Walk, Pedestrian Change, Yellow Change, Red Clearance, Minimum Green, Extension/Passage, Maximums, and Volume-Density.
About the Author:
David Sadeghi is senior manager, digital marketing at Iteris.
