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
Results
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