Class_37_Signalized_Intersections

Class_37_Signalized_Intersections - The Pennsylvania State...

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Unformatted text preview: The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Class # 37: Signalized Intersection Analysis Spring 2008 Purposes: 1. Orderly assigned Right-of-Way through time-sharing at intersection 2. Safety 3. “Not” a panacea ! Purposes: 1. Orderly assigned Right-of-Way through time-sharing at intersection 2. Safety 1. “Not” a panacea ! 2. What aspects of traffic signals are annoying for you? 3. When do you feel that a signal is “not working efficiently”? Advantages 1. Orderly movement 2. Reduce right angle accidents 3. Increased capacity 4. Allow pedestrian crossing 5. Coordination 6. Driver confidence Disadvantages 1. Increased delay 2. Increase rear-end crashes 3. Promote disrespect when unwarranted or misapplied 4. Driver irritation - improperly timed 5. Cause drivers to seek less adequate routes 6. Expensive to install signals (> $100K) Manual on Uniform Traffic Control Devices (MUTCD) Eight (8) traffic signal warrants: – Eight-hour volume – Four-hour volume – Peak-hour – Pedestrian volume – School Crossing – Coordinated Signal – Crash Experience – Road Network Typical Signalized Intersection Traffic Signal Terminology Green Time (G)- time within cycle in which an approach has green indication (sec). Red Time (R)- time within cycle in which an approach has red indication (sec). Yellow Time (Y)- time within cycle in which an approach has yellow indication (sec). All-Red Time (AR)- time within cycle in which all approaches have red indication (sec). – Also known as clearance interval. Traffic Signal Terminology Cycle- complete signal sequence. Cycle Length (C)- time (sec) to complete a cycle. Phase ( φ )- part of a cycle allocated to specific movement(s). Sum of phase lengths (sec) is cycle length. Change Interval = Yellow + All Red (sec) Traffic Signal Controller- controls sequence, duration and logic. Movement – vehicles discharging during green characterized by direction and lane(s) utilized Traffic Signal Terminology Lost Time (t L ) - Time during which intersection not effectively used by any approach (sec)....
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Class_37_Signalized_Intersections - The Pennsylvania State...

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