The Commercial Learner's Permit (CLP) is the credential you receive after passing the CDL knowledge exams but before taking the behind-the-wheel skills test. It's a federally required step — every CDL holder in every state had a CLP first — and it has very specific rules that trip up new applicants.
What the CLP lets you do
With a CLP, you may operate a commercial motor vehicle on public roads only when accompanied by a CDL holder of the same or higher class who is physically present in the front seat next to you and holds the same endorsements you're testing for (with the exception that you don't need a P-endorsed supervisor for non-passenger CMVs and you don't need an S-endorsed supervisor outside school routes). You may not transport passengers (other than the supervisor and authorized trainees) and may not transport hazardous materials in placarded quantities.
How to get a CLP
Visit your state DMV with: a valid driver's license, proof of residency, Social Security card, current DOT medical card, and your ELDT certificate (for first-time Class A or B). Pass the General Knowledge written exam plus any required endorsement exams, pay the fee ($15 to $40 depending on state), and the CLP is issued the same day in most states.
The 14-day holding period
Federal law requires you to hold the CLP for a minimum of 14 calendar days before you can take the skills test. The 14 days begin the moment the CLP is issued, not the moment you first drive. Many candidates use this time productively — arranging a skills-test appointment, completing additional behind-the-wheel hours, and finalizing their ELDT theory completion.
How long the CLP is valid
The CLP is valid for 180 days under federal regulations. Some states allow a single 180-day renewal without re-taking the knowledge exams; others require fresh testing if you don't pass your skills test before expiration. Plan your training to fit comfortably within 90 days to avoid renewal hassles.