CDL Endorsement Guides
Learn what the major CDL endorsements cover and the additional testing or training they may require.
CDL Doubles/Triples Endorsement 2026: Full T Guide
CDL Doubles/Triples (T) endorsement 2026: why triples are legal in only ~20 states, rearward amplification, and the Class A-only rule.
CDL Endorsements Explained: All 6 Codes
Every CDL endorsement explained — H, N, T, P, S, and X. What each allows, who needs it, which require a skills test, and what the TSA check costs.
CDL Hazmat Endorsement 2026: Full TSA Process Guide
CDL Hazmat endorsement 2026: TSA Security Threat Assessment, disqualifying offenses, and why it can't renew like other endorsements.
CDL Passenger Endorsement 2026: Full P Endorsement Guide
CDL Passenger (P) endorsement 2026: the 16-passenger threshold, why California sets it lower at 10, the required skills test, and ELDT requirements.
CDL School Bus Endorsement 2026: Full S Endorsement Guide
CDL School Bus (S) endorsement 2026: background checks, why California and Texas require a separate certificate beyond the CDL, and ELDT requirements.
CDL Tanker Endorsement 2026: Full N Endorsement Guide
CDL Tanker (N) endorsement 2026: the 119/1,000 gallon threshold, baffled vs unbaffled vs bulkheaded tanks, outage, and why it's faster to get than Hazmat.