Traffic Engineering

Working within the framework of our clients’ budgets and design constraints, DEA’s engineers blend practical approaches with technical innovation to create solutions that work for all modes of transportation, including automobiles, high-occupancy vehicles, trucks, transit, and non-motorized travel.


  • Bicycle lanes
  • Channelization
  • Commercial vehicle operations
  • Electronic toll collection
  • Environmental assessment
  • Operations management
  • Parking operations studies
  • Radar speed studies
  • Rail grade crossings
  • Safety studies
  • School route analyses
  • Signage and striping
  • Signal design
  • Traffic control device inventories
  • Traffic signal timing
  • Traffic simulations
  • Transit priority signals
  • Transportation impact studies
  • Traveler information
  • Truck weigh stations
SR 202 Woodinville Roundabouts

The intersection of SR 202 and 145th Ave NE had been operating at a poor level of service for years. DEA proposed a unique three-roundabout system that would provide U-turn opportunities for adjacent businesses while producing a calming effect on approaching high-speed traffic.

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