OR 174 In-Service Road Safety Audit

  • MMM was retained to assess a 12-km section of legacy two-lane, two-way, rural highway to evaluate the benefits of moving to a full multi-lane divided highway format
  • Evaluated the safety impacts of highway geometrics, congestion effects, and rural highway passing operations; roadside safety analysis; accommodation of pedestrians and cyclists; assessment of transition zones to settled areas along the highway; and consideration of positive guidance and human factors
  • Employed collision pattern and risk analysis, stakeholder consultation, and cost-effectiveness evaluation of both strategic and tactical road safety countermeasures
  • Calibrated and applied the FHWA Interactive Highway Safety Design Model to check geometric policy compliance, to evaluate road safety, and assess passing opportunities


  • transportation planning
  • safety review
  • functional design
  • cost estimates