Abstract Manager

The in-service road safety review evaluates the highway’s safety performance and identifies segments prone to collisions. Tetra Tech study examined the 5-year collision history of 83 segments, each 10 kilometers long (totaling about 830 km). Using established provincial thresholds and criteria, segments where safety performance fell below acceptable benchmarks were identified. Stakeholder consultations were crucial for understanding the safety challenges faced by road users and selecting collision-prone segments.

The primary objective of this study is to identify road deficiencies and hazards, analyze collision trends, and pinpoint high-risk locations along the Alaska Highway for potential improvements. We assessed factors influencing safety, including traffic operations, geometric design, visibility, pavement conditions, road markings, signage, intersections, and access points. This multifaceted approach aimed to uncover the underlying causes of hazards in these segments.

Our methodology followed a systematic, data-driven framework designed to enhance safety. The process began with network screening to identify locations with collision rates exceeding critical thresholds. Engaging stakeholders provided valuable local insights, essential for a comprehensive safety performance assessment. To investigate the root causes of identified safety issues, we employed drive-through assessments collision data analysis, and reviews of road geometry and operations. For evaluating certain geometric elements and enhancing visibility, we utilized images and LiDAR/GPS data.

Based on the findings, we proposed evidence-based safety improvements, leveraging collision modification factors (CMFs) from the Transportation Association of Canada (TAC) and other sources. An benefit-cost analysis enabled us to compare the costs of proposed countermeasures against their anticipated safety benefits. Ultimately, the study identified nine hazardous segments based on collision analyses and stakeholder feedback. We provided a comprehensive list of potential hazards and recommended improvements, accompanied by benefit-cost ratios to facilitate informed decision-making. This study aims to enhance road safety and contribute to a more resilient transportation network.

Following the in-service safety review, a corridor improvement traffic study was undertaken to assist with long-term transportation strategic policy actions to enhance the mobility and connectivity of the Alaska Highway Corridor. The primary objective was to determine future traffic demands and identify improvement measures to accommodate changes in traffic demand. The scope of services included stakeholder consultation, intersection warrant analyses, review of corridor amenities (i.e. service rest areas) and investment implementation strategies. The findings from the road safety review were incorporated to identify the investments required to address existing safety issues.