49 CFR 397.13(a): Permitting a person to smoke or carry a lighted cigarette, cigar or pipe within 25 feet of a motor vehicle containing Class 1 materials, Class 5 materials, or flammable materials classified as Division 2.1, Class 3, Divisions 4.1 and 4.2
Audit factor: Hazardous Materials
Severity: critical
Automatic failure: no