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How to look up US trucking carriers by USDOT or MC number using free FMCSA data

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A how-to guide explains how to check a US motor carrier's status, operating authority and safety rating using FMCSA's open data on data.transportation.gov. Two datasets are used: the Company Census File, which lists one row per USDOT number, and the Motus Carrier file, which lists operating authorities by docket number. Both can be queried with a single GET request, requiring no API key or account. The guide walks through a curl example for Old Dominion Freight Line, showing it is active, interstate and rated Satisfactory. It also explains the meaning of the data's status, operation and safety rating codes, and provides a Python script that accepts either a USDOT or MC number.

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