The Missouri State Highway Patrol and Missouri Department of Revenue wish to inform the public there has been a change to the commercial driver license testing procedure. Commercial driver license (CDL) applicants need to be aware Missouri is adopting a modernized testing standard effective December 4, 2023. CDL examiners at all Patrol examination sites and all third-party examination sites will utilize the new testing procedure. The changes in testing procedure include a more streamlined pre-trip examination and more efficient basic skills course. Those wishing to prepare for a CDL skills test administered December 4 or later should utilize the following CDL manual to learn applicable procedures: New Missouri CDL Manual. The current testing procedures will remain in effect statewide until December 1.