Massachusetts CDL Study Guide
Massachusetts issues Commercial Driver Licenses (CDLs) through the Registry of Motor Vehicles (RMV). To get one you study the Massachusetts CDL Manual, pass written knowledge tests for a Commercial Learner's Permit (CLP), hold the permit at least 14 days, complete federally required Entry-Level Driver Training (ELDT), and pass a road skills test at an RMV-approved location.
Key Massachusetts numbers
- Minimum age (intrastate): 18
- Minimum age (interstate or hazmat): 21
- CLP hold before skills test: at least 14 days
- General Knowledge passing score: 80%
- General Knowledge test: ~50 questions
- Air Brakes test: ~25 questions (required if your vehicle has air brakes)
- Combination Vehicles test: ~20 questions (required for Class A)
Topics on the Massachusetts General Knowledge test
- Vehicle inspection (pre-trip, en-route, post-trip)
- Driving safely (speed management, space management, hazard perception)
- Transporting cargo safely
- Air brakes (if your vehicle is air-braked)
- Combination vehicles (Class A)
If you fail a test
Massachusetts limits CDL skills test attempts to no more than 6 within any 12-month period. After failing a knowledge or skills test, you may reschedule and pay the applicable fee again. ELDT does not have to be repeated for a skills retest.
Frequently asked questions
Who issues CDLs in Massachusetts?
The Massachusetts Registry of Motor Vehicles (RMV), part of MassDOT, issues all commercial driver licenses.
How much does a Massachusetts CDL cost?
The general knowledge test is $30, each endorsement test taken with the CLP is $10 (otherwise $30), the road test is $35, and the 5-year CDL license is $75.
How long must I hold my Massachusetts CLP?
At least 14 days before the RMV will let you take the skills test.
Whatu0027s the minimum age for a CDL in Massachusetts?
18 for intrastate driving (with a u0027Ku0027 restriction). 21 for interstate operation, hazmat, and many passenger jobs.
How many CDL skills tests can I take per year?
Massachusetts allows no more than 6 CDL skills test attempts in any 12-month period.
How many questions are on the Massachusetts General Knowledge test?
50 multiple-choice questions, and you need 80% (40 correct) to pass.
Free practice
Start a Massachusetts General Knowledge quiz →
Sources: Massachusetts CDL classes and endorsements Massachusetts CDL Manual March 2025 (PDF) Massachusetts RMV Schedule of Fees (PDF) Apply for a Commercial Learneru0027s Permit (CLP)