How CIMA+ Leveraged AirSage Safety Events Data to Advance Proactive Road Safety for Transport Canada

Enhanced Network-Wide Safety Assessment
AirSage Safety Events data improved the calibration and predictive performance of traditional Safety Performance Functions (SPFs), with modest improvements in prediction accuracy across multiple facility types. While the resulting network screening rankings remained largely unchanged, the analysis demonstrated that CV data can strengthen established safety assessment methods while maintaining consistency with traditional engineering practices.

Proactive Identification of Potential Safety Risks
Because safety events occur more frequently than collisions, CIMA+ used AirSage data to identify locations exhibiting elevated levels of harsh braking and acceleration that may not have been highlighted through collision-based network screening alone. This provided agencies with an additional tool to proactively investigate locations before more severe safety issues emerge.

Location-Based Safety Analysis
AirSage data enabled CIMA+ to conduct detailed, location-based safety assessments at intersections and along road segments. By analyzing the spatial distribution of safety events and vehicle movements, CIMA+ gained insight into site-specific conflict patterns that are not typically visible through collision records alone, supporting more targeted safety reviews and operational assessments. 

For example, the image below presents individual safety events together with their associated turning movements and event types. In this example, the northbound and southbound approaches exhibit the highest frequency of events, highlighting areas that may warrant further investigation. These insights help practitioners identify potential conflict patterns, support location-specific safety diagnoses, and complement traditional collision datasets by providing additional proactive information on roadway safety performance.