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§383.3 - Applicability
Guidance Q&AQuestion 2: Do mechanics, shop help, and other occasional drivers need a CDL?
Guidance: Yes, if the vehicle is a CMV and is operated or test-driven on a public highway.
Are personnel involved in road testing CMVs across a State line subject to the FMCSRs?
Guidance: Yes, any driver (including mechanics, technicians, driver trainees and other personnel) operating a CMV in interstate commerce must be in compliance with the FMCSRs.