DOT number

A DOT number is a unique identifier assigned by the Federal Motor Carrier Safety Administration (FMCSA) to commercial vehicles that transport passengers or haul cargo in interstate commerce. The FMCSA requires companies operating commercial vehicles with a gross vehicle weight rating (GVWR) of 10,001 pounds or more, including examples like freight trucks and passenger buses, to obtain a DOT number.

Insurance providers verify DOT numbers to confirm regulatory compliance before issuing policies for motor carriers. Proof of minimum insurance levels–for example, $750,000 liability for general freight and $5 million for hazardous materials–must be filed under a carrier’s DOT number.

Insurers use a company’s DOT number to access safety performance records and accident histories via the FMCSA’s SAFER system. The DOT number stays linked to the legal business entity even if vehicles change, as seen with larger fleets such as FedEx or Swift Transportation.

States may require DOT numbers for intrastate operations exceeding certain thresholds, such as Texas mandating them for vehicles over 26,000 pounds used in commerce within state borders. Policy underwriters assess risk by reviewing violations tied to a business’s DOT number; these include citations for hours-of-service breaches or maintenance failures.

Lapses in mandatory insurance coverage are reported under the DOT number and can result in out-of-service orders from FMCSA. Insurance brokers request an applicant’s DOT number when quoting commercial auto policies to ensure correct coverage limits and policy forms.

Renewal notices sent by insurers reference the insured entity’s DOT number to comply with federal proof-of-insurance filing regulations, as registered by the Insurance Information Database.