If you are a first-time Commercial Driver License (CDL) applicant, you must obtain a CDL instruction permit to operate a vehicle requiring a CDL on the highway. The CDL instruction permit is valid for six months. The minimum age for a CDL is 21. If you are at least 18, you may apply for an intrastate CDL that is valid only in Arizona. Drivers under the age of 21 are prohibited from transporting hazardous materials.
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