Which statement best describes the use of SPF in road safety planning?

• A. CMF-based calculation using local data.
• B. Travel time estimates.
• C. Fuel efficiency projections.
• D. Vehicle occupancy assessments.

Answer: (C)

SPF in road safety planning captures how traffic exposure and road features translate into safety outcomes, and it often involves looking at how driving conditions shaped by safety measures affect vehicle performance. Because fuel use is highly influenced by driving conditions like speeds, stops, and acceleration patterns, projecting how fuel efficiency changes under different safety scenarios is a natural output of SPF analysis. This connection makes fuel efficiency projections the best description among the options.

Travel time estimates relate more to congestion and delay, not the safety-performance relationship SPF is about. Vehicle occupancy assessments focus on how many people travel in each vehicle, which is a demographic metric rather than a safety-performance result. CMF-based calculations are about adjusting crash estimates after implementing treatments, not describing SPF’s typical use.