The North American Standard Out-of-Service Criteria (OOSC) is the pass-fail criteria for inspections. The purpose of the criteria is to identify critical violations. Those violations render the driver, vehicle and/or cargo out of service until the condition(s) or defect(s) can be corrected or fixed.

The North American Standard Out-of-Service Criteria identifies critical vehicle inspection items and details the criteria that can prohibit a motor carrier or driver from operating a commercial motor vehicle for a specified period of time or until the condition is corrected.