Reference

Wheel chocks are required by OSHA in three specific situations, none of them in the DOT vehicle equipment rules. This guide gives the exact citations, the quarter-diameter sizing convention and what overrides it, the difference between a vehicle chock and a pallet-jack chock, and how to place a chock so it actually holds.

FMCSA amended 393.95 twice in 2026, both times by deletion: liquid-burning flares ceased to be an accepted warning device in March, and the spare-fuse requirement was removed in April. This guide gives what the section still requires, the extinguisher ratings and condition rules, and the 392.22 placement patterns for every road type.