This is a mandatory requirement. 49 USC 31308, RCW 46.25.070 . A CDIP may be issued to an individual who holds a valid automobile or commercial driver license. The holder of a CDIP may drive a commercial motor vehicle on a highway only when accompanied by the holder of a commercial driver license, valid for the type of vehicle driven, who occupies a seat beside the individual, for the purpose of giving instruction in driving the commercial motor vehicle. The CDIP is valid for six months and may be renewed one time only.
Test scores are valid for one year from the date of the test.
The skill test consists of a pre-trip inspection and a road test, and takes up to 90 minutes. After a CDL is issued, adding a passenger endorsement, upgrading a license or removing the air brake restriction requires both knowledge and skill tests and applicable fees. To obtain a CDL you will need to pay the appropriate fees. These fees are in addition to any fees for your basic driver license . Both WUTC and WSP rules and regulations authorize intrastate drivers who do not meet minimum medical standards to apply to the Department of Licensing for an intrastate medical waiver.