Glossary
PHMSA
The Pipeline and Hazardous Materials Safety Administration, the federal agency that writes the Hazardous Materials Regulations governing how hazmat is classified, packaged, marked, and transported. Haul Handbook publishes no state-by-state page for this term, across 26 live states, checked Aug 9, 2026.
By Evan Reid, Founder of Haul Handbook · Updated Jul 19, 2026
Carriers hauling placardable hazmat register with PHMSA and follow its rules alongside FMCSA safety rules.
Where this term is defined
This definition follows the authority that defines the term. Read the source directly:
PHMSA, Hazardous Materials SafetyRead more
The full guide goes past the definition into the filings, deadlines, and steps: Hazmat trucking authority.
Related terms
Apportioned plate
A single license plate issued under the IRP that lets a commercial vehicle operate in every member jurisdiction. The registrant pays each jurisdiction a share of the fee based on the miles the fleet travels there.
Base jurisdiction
The single state or province where a carrier registers under IRP and licenses under IFTA, chosen by where the fleet is based and keeps its records. The base jurisdiction collects the fees and taxes and settles them with the other member jurisdictions.
BMC-84 surety bond
The surety bond a property broker or freight forwarder files with FMCSA as its financial responsibility instrument. It guarantees payment to carriers and shippers; a broker may instead file a BMC-85 trust fund for the same amount.
BMC-91
The form an insurer files with FMCSA to prove a motor carrier carries the required public liability (bodily injury and property damage) coverage. It is one of the filings that must be on record before for-hire authority becomes active.