The selection of a crash rate threshold to screen potential roadway hotspots is part of which methodology?

• A. Benefit-cost analysis
• B. Critical collision rate method
• C. Hotspot Potential Method
• D. Crash Frequency Method

Answer: (B)

Screening roadway sites for hotspots by applying a crash-rate threshold is the idea behind the Critical Collision Rate method. Here, a predefined rate of crashes per unit of exposure (for example, crashes per million vehicle miles) is used to judge whether a site's crash experience is unusually high for the amount of traffic it handles. If the observed rate exceeds the threshold, the site is flagged for further investigation or intervention; if not, it is deprioritized. This approach focuses on whether crashes occur more often than expected given traffic volume, rather than just counting total crashes or weighing economic factors.

In contrast, counting crashes alone (crash frequency) can bias toward busier roads and miss high-risk spots with lower traffic. The Hotspot Potential Method looks at multiple indicators beyond a fixed rate and estimates a location’s likelihood of becoming a hotspot, rather than using a single threshold. Benefit-cost analysis, meanwhile, assesses the economic costs and benefits of safety measures rather than identifying hotspot locations.