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US DOT Dictionary
US DOT Dictionary
US DOT Dictionary
US DOT Dictionary
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US DOT Dictionary

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This comprehensive Department of Transportation (DOT) glossary serves as a centralized reference for terminology found within Title 49 of the Code of Federal Regulations (49 CFR), specifically covering both the Federal Motor Carrier Safety Regulations (FMCSR) and Hazardous Materials Regulations (HMR). 
Core Content and Regulatory Sources.


This dictionary consolidates definitions from several critical regulatory sections:
  • FMCSR Definitions (49 CFR 390.5): Includes foundational terms for the motor carrier industry such as Commercial Motor Vehicle (CMV), Accident, Driver, and Employer.
  • Hazmat General Definitions (49 CFR 171.8): Provides the specific legal meanings for terms like Hazardous Material, Hazmat Employee, Bulk Packaging, and Shipping Paper.
  • Hazardous Materials Program Definitions (49 CFR 105): Contains definitions related to the administration of the hazmat program, including Person and Offeror.
  • Safety Permit Definitions (49 CFR 385.402): Details specific terminology for carriers requiring specialized hazardous materials safety permits. 
The definitions are directly from the regulations to ensure technical precision.  This 110-page book also contains commonly used acronyms and conversion tables.

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US DOT Dictionary
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