Congestion Causes and Solutions. Traffic Congestion Characteristics Slower speeds Longer trip time Increased queues More vehicles.

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Presentation transcript:

Congestion Causes and Solutions

Traffic Congestion Characteristics Slower speeds Longer trip time Increased queues More vehicles

Congestion Components

Level of Service A: Free flow B: Stable flow C: restricted maneuverability D: Instability E: At capacity F: Stop-and-go

Sources of Traffic Congestion

Ten Worst Freeway Bottlenecks in US 2002 City Freeway Annual Hours of Delay Los Angeles US 101 / I ,144,000 Houston I-610 / I-10 25,181,000 Chicago I-90 / I ,068,000 Phoenix I-10 / SR ,805,000 Los Angeles I-405 / I-10 22,792,000 Atlanta I-75 / I-85 21,045,000 Washington DC I-495 / I ,429,000 Los Angeles I-10 / I-5 18,606,000 Los Angeles I-405 / I ,606,000 Atlanta I-285 / I-85 17,072,000

Travel Time Reliability

Solutions to Congestion Adding Capacity Tolling and Pricing Real Time Traveler Information Traffic Management Traffic Signal Timing Travel Rationing Parking Restrictions Public Transport Improvements Policy Approaches to Minimize Travel

Traffic Management Incident Management Work Zone Management Weather Management Freeway, Arterial Corridor Management

Sources 2007 Mobility Reporthttp://mobility/tamu.eduhttp://mobility/tamu.edu Congestion Definitionhttp:// London Congestion Charginghttp:// London Congestion Monitoringhttp://tfl.gov.uk/tfl_monitoring.shtmlhttp://tfl.gov.uk/tfl_monitoring.shtml Arterial Managementhttp://ops.fhwa.dot.gov/arterial_management/indexhttp://ops.fhwa.dot.gov/arterial_management/index FAST-TRAC (Oakland) CHART (Maryland) IOP (WSDOT – Seattle) Safety ARTIMIS (Cincinnati) Traffic.com (Philadelphia) WisconsinTraffic (Wisconsin)