Abstract Manager

The in-service road safety review evaluated the Alaska Highway’s safety performance and identified segments with high collision risk. Tetra Tech analyzed a 5-year collision history of 83 segments, each 10 km long (totaling ~830 km), using provincial thresholds to identify underperforming locations. Additionally, segments highlighted during stakeholder consultations were considered critical even if they met provincial thresholds.

The study aimed to identify road deficiencies and hazards, analyze collision trends, and pinpoint high-risk locations. Factors influencing safety included traffic operations, geometric design, visibility, pavement conditions, road markings, signage, intersections, and access points. A systematic, data-driven methodology combined network screening, stakeholder input, drive-through assessments, collision data analysis, and reviews of geometry and operations, supplemented with images and LiDAR/GPS data for specific evaluations.

Evidence-based safety improvements were proposed using collision modification factors (CMFs), with benefit-cost analyses comparing the costs of proposed measures to anticipated safety benefits. Nine hazardous segments were identified, and comprehensive hazard lists and recommended improvements, supported by benefit-cost ratios, were provided to guide decision-making.

Following the safety review, a corridor improvement traffic study assessed future traffic demands and identified measures to enhance mobility and connectivity. The study scope included stakeholder consultations, intersection warrant analyses, speed review, corridor amenity assessments (e.g., service rest areas), and deployment of the Scout Plus system (Miovision) for traffic counts to inform investment strategies. Findings from the safety review were integrated to guide investments addressing existing safety and traffic challenges, supporting long-term corridor resilience and strategic policy decisions.