In short
Department of Motor Vehicles — the US state-level authority that runs road tests.
DMV stands for Department of Motor Vehicles. Each US state runs its own DMV (or equivalent — PennDOT in Pennsylvania, BMV in Indiana, MVA in Maryland, RMV in Massachusetts, DPS in Texas, etc.).
The state DMV sets and runs road tests, issues driver's licenses, and maintains driving records. Unlike the UK's single national DVSA, US road-test syllabuses, fees, and pass standards vary significantly by state — which is why Driving Routes splits route data by state.
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