Connecticut CDL endorsements are easier to plan when you see them as a menu with a cost in study time, not as a pile of letters. Each endorsement adds a knowledge test, and a few add a skills test, an age limit or a background check. This roadmap walks through the choices on the Connecticut Department of Motor Vehicles (DMV) list so you can decide what to test for before you pay for anything.
Which Connecticut CDL endorsements can you add?
- T (doubles and triples): a 20-question knowledge test.
- P (passenger): a 20-question knowledge test, plus a skills test in a passenger vehicle under federal rules.
- S (school bus): a 20-question knowledge test, and it builds on the passenger endorsement.
- N (tank vehicle): a knowledge test, with size rules covered below.
- H (hazmat) and X (hazmat plus tank): a hazmat knowledge test, a background check and an age minimum.
The air brakes test is not an endorsement but a separate knowledge test, with 25 questions. Connecticut also tests combination vehicles for Class A applicants, with 20 questions.
How many questions are on each Connecticut CDL test?
Connecticut sets its pass marks by test. The DMV lists these numbers:
- Air brakes: 25 questions, 20 correct to pass.
- Combination vehicles, school bus, passenger, and doubles and triples: 20 questions each, 16 correct to pass.
- Hazmat: 24 correct out of 30.
- General knowledge: 50 questions, 40 correct to pass.
Those are all 80 percent scores, which makes the math simple: if you miss more than one in five, you retake the test.
Do you need training before testing for Connecticut endorsements?
First-time Class A and B applicants, and anyone adding the S, P or H endorsement for the first time, go through entry-level driver training. The DMV says the theory part covers five topics and requires 80 percent. It sets no minimum number of behind-the-wheel hours, although your school may still require practice time before it signs off. Choose a training provider that is on the federal registry, and ask how it plans to cover the endorsement you want.
What counts as a tank vehicle in Connecticut?
For the N endorsement, Connecticut counts tanks of 119 gallons or more that are permanently mounted, or 1,000 gallons or more if portable. A pickup carrying a small portable tank is a very different case from a tanker, so check your actual equipment against those two numbers.
What are the hazmat and age rules for H and X?
Both H and X require you to be 21. Because hazmat involves a federal background check, plan for processing time. If you renew a hazmat endorsement, Connecticut may issue a temporary one that is valid for 90 days, and hazmat renewals are handled only at designated offices. Do not count on an ordinary branch visit.
Does a school bus endorsement have special rules in Connecticut?
Connecticut defines a vehicle designed for 11 or more passengers, including the driver, as a commercial motor vehicle when it carries students under 21 to and from school. That is lower than the 16-passenger threshold that most people associate with buses. If you drive a van or small bus for a school or program, ask the DMV whether the S and P endorsements apply to you.
How do you book a Connecticut CDL skills test?
Connecticut handles skills test requests by email on Form R-405. The DMV then gives you a test date within three business days. After you pass, you wait two business days for your license. That timeline means you can plan work around the test, but it also means you should have your paperwork ready the first time you send the form.
The CLP is valid for one year from the date of issuance. Remember that you must be registered with the FMCSA Drug and Alcohol Clearinghouse, and that your medical certificate now comes to the DMV electronically from the National Registry. Miss the medical deadline and your license is downgraded to Class D.
Order your endorsements by the work you want. A driver who plans to haul fuel needs N and H, which together fit the X endorsement.
What endorsements can I get on a Connecticut CDL?
The list includes T for doubles and triples, P for passengers, S for school bus, N for tank vehicles, H for hazmat and X for hazmat plus tank.
How many questions are on the Connecticut hazmat test?
The hazmat knowledge test has 30 questions, and you need 24 correct to pass.
How old do you have to be for a hazmat endorsement in Connecticut?
You must be 21 for the H and X endorsements.
What size tank needs an N endorsement in Connecticut?
Tanks of 119 gallons or more that are permanently mounted, or 1,000 gallons if portable.
How do I request a Connecticut CDL skills test?
Email the DMV with Form R-405. The DMV gives a test date within three business days.
Test details, forms and rules change. Confirm every item with the Connecticut Department of Motor Vehicles before you test.