I-405 HOT Lanes

ITS, toll coordination, and illumination design for 23+ mile I-405 freeway improvement project.

Quick Facts

  • Coordinated with a toll system integrator during the design of ITS infrastructure

  • Project included 42 electronic toll gantries, 23 toll rate signs, over 40 miles of fiber optic design, 3 ramp meters, 26 CCTV cameras, 4 VMS, 3 HARS, 4 communication hub tie-ins, and 26 ES data cabinets

  • Over 15 miles of illumination design for the freeway, toll zone illumination, and on/off ramp illumination


  • Increased traffic capacity. Added additional traffic capacity between Kirkland and Bothell, and combined with the existing HOV lane to create a two-lane express toll system in both directions

  • Improved transit reliability and time reliability for toll lane users from Bellevue to Lynnwood

  • The addition of the northbound and southbound lanes between NE 6th Street and SR 522 reduces congestion by increasing capacity

  • Improved I-405 braided ramps between NE 160th Street interchange and SR 522 improved traffic flow and reduced conflicting traffic in a heavily traveled freeway corridor

  • The additional capacity reduces sideswipe and congestion-related collisions

  • When the final widening HOV project is completed from Renton to Bellevue along the I-405 High Occupancy Toll (HOT) lane corridor will extend from SR167/ SR 18 in Auburn to I-405/ I-5 in Lynnwood

Our Work

  • Led the ITS, illumination, and toll coordination for this freeway improvement project

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