[1] FHWA, Highway Safety Improvement Program Manual, 6.1 (January 2010), available at: https://highways.dot.gov/safety/hsip/highway-safety-improvement-program-manual.

[2] FHWA, State Serious Injury Conversion Tables, available at: https://safety.fhwa.dot.gov/hsip/spm/conversion_tbl/.

[3] FHWA, Section 148: Older Drivers and Pedestrians Special Rule Final Guidance (May 19, 2016), available at https://www.fhwa.dot.gov/map21/guidance/guideolder.cfm.

[4] Incorporated in 23 CFR Parts 924 and 490, respectively.