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Assess applicability of SHRP-2 crash benchmarks to dense urban ride-hailing contexts

Evaluate the applicability of SHRP-2 naturalistic driving study rear-end struck crash benchmarks to dense urban surface-street ride-hailing operating domains such as San Francisco, Phoenix, and Los Angeles by stratifying benchmarks by location and road type and aligning exposure characteristics with automated ride-hailing fleets.

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Background

The paper cautions that benchmark crash rates vary with geography and road type, calling into question the relevance of SHRP-2 benchmarks for current ADS operating areas. Misapplied benchmarks can misrepresent ADS safety performance.

A targeted evaluation of SHRP-2 benchmark applicability would support more valid cross-paper comparisons and improve methodological rigor in ADS safety assessments.

References

As noted in Scanlon et al. (2024a), benchmark crash rates can be influenced by factors such as location and road type, so it is unclear how applicable the SHRP-2 benchmarks are to the locations where Waymo RO operations are.

— Comparison of Waymo Rider-Only Crash Rates by Crash Type to Human Benchmarks at 56.7 Million Miles (2505.01515 - Kusano et al., 2 May 2025) in Appendix – Comparisons to Prior Studies