I-5/I-405 Active Traffic Incident Management

Smooths traffic flow and reduces crashes through bottleneck areas.

Quick Facts

  • Active Traffic Incident Management (ATIM) project that includes variable speed limit (VSL) systems along a 1.75-mile section of I-5 and a 2-mile section of I-405 in Portland

  • Includes variable speed signs, vehicle detection and wireless communications

  • First wireless mesh network installed for ODOT


  • Smooths traffic flow and reduces crashes through the bottleneck area where I-5 and I-405 merge using management techniques

  • Includes innovative access for maintenance personnel in a tough freeway environment

Our Work

  • Led the design team and the deployment of the VSL system, including systems engineering, site survey, environmental documentation, structural engineering, geotechnical analysis, communications design, and preliminary, advanced and final construction documents

  • Provided initial path analysis, designed the wireless mesh networks with redundant wireless backhauls, and worked with ODOT to configure the equipment in the test environment before installing the wireless communications system for the Marquam Bridge

  • Provided a design using dual mesh networks at different frequencies, 4.9 GHz and 5.8 GHz, which provided more redundancy and finer control allowing ODOT to separate and prioritize the network traffic

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