Out of Service (OOS)
A status applied to a commercial vehicle or driver that has been found in violation of safety regulations during a DOT inspection, prohibiting them from operating until the violations are corrected. An OOS order on a vehicle means the truck cannot move until mechanical defects are repaired. An OOS order on a driver means they cannot operate a commercial vehicle until they come back into compliance (e.g., completing required rest hours or obtaining a valid medical certificate).
Detailed Explanation
A status applied to a commercial vehicle or driver that has been found in violation of safety regulations during a DOT inspection, prohibiting them from operating until the violations are corrected. An OOS order on a vehicle means the truck cannot move until mechanical defects are repaired. An OOS order on a driver means they cannot operate a commercial vehicle until they come back into compliance (e.g., completing required rest hours or obtaining a valid medical certificate).
Example
During a roadside inspection, an officer finds the truck's brake pads are worn below legal limits and places the vehicle out of service. The carrier must dispatch a mobile mechanic to replace the brakes before the truck can move.
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