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5.1.2 Cab Doors (393.203)

Cab doors or door parts used as an entrance or exit cannot be missing or broken and must be fully operable. No door may be wired shut or otherwise secured closed so that it cannot be easily opened, except when a vehicle is loaded with pipe or bar stock that blocks the door and the cab has a roof exit.

See 49 CFR 393.203 for full requirements and exceptions for cab doors.

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