Mississippi CDL Practice Test

The Driver Service Bureau doesn’t publish its test sizes. Our practice tests follow the usual CDL format: General Knowledge 50 questions (40 to pass), Hazmat 30 (24), Air Brakes 25 (20), and Combination, Tank, Doubles/Triples, Passenger and School Bus 20 each (16).

The Mississippi CDL Driver’s Manual (AAMVA, version March 2025): the CDL introduction, inspection, safe driving, cargo, passengers, air brakes, combination vehicles, doubles and triples, tankers, hazardous materials and school buses.

You may test on three days in a row. If you fail again on the third day, there's a seven-day break before your next attempt at that test.

80% on each of the 8 tests, each graded on its own (General Knowledge: 40 of 50). Every test's numbers are in the table on this page. Always confirm the current tests with the Mississippi Department of Public Safety, Driver Service Bureau. Why 80% in every state →

Classes A (combinations), B (heavy single vehicles) and C (smaller vehicles for 16 or more people, or placarded hazmat). Endorsements: H hazmat, N tank, T doubles and triples, P passenger, S school bus, and X for hazmat and tank together.

A light commercial license, not a CDL: it covers commercial driving under 26,000 pounds, such as a vehicle with a business logo, a taxi or a limousine. It needs only a Class D written test, with no medical card or passenger endorsement; a pickup needs no commercial license unless it carries placarded hazmat.

Passenger does: a knowledge test and a skills test. Doubles/Triples, Tank and Hazmat need a knowledge test only, and X combines the Tank and Hazmat endorsements.

At least 60 days before the CDL expires, by enrolling with TSA before the knowledge test. In Mississippi the enrollment centers are in Jackson, Greenville, Gulfport and Vicksburg (the list can change); walk-ins are taken, but appointments go first.

Not for 15 passengers or fewer. A commercial vehicle under 26,000 pounds carrying up to 15 passengers is covered by the Class D light commercial license. Once a vehicle is designed for 16 or more people, driver included, you need a Class C CDL with the passenger endorsement.

No. A hazmat endorsement from another state doesn't carry over: you transfer your CDL without the H, then apply to add it, which means a new TSA security threat assessment and the hazmat knowledge test.

180 days from the date on TSA's approval letter. Go back to a CDL station within that time to have the H endorsement put on your license; wait longer and you have to go through a new security threat assessment.

Whenever your CDL's issue date is more than two years old and you want to keep the hazmat endorsement, whether you're renewing a Mississippi CDL or bringing one from another state. The hazmat retest is given only at a CDL station.

At least 21. The Department of Public Safety's driver manual says the Mississippi Department of Education sets 21 as the minimum age for a school bus license, so a younger driver can't carry pupils even with an in-state CDL.

45 mph on regular routes taking children to and from school, and 65 mph on the interstate, whatever higher limit is posted for cars. Every vehicle, bus or not, is held to 15 mph in a school zone.

Before the skills test for a first Class A or B CDL, a B-to-A upgrade or a first P or S endorsement, and before the knowledge test for a first hazmat endorsement. Training must come from a provider on FMCSA’s Training Provider Registry.

By phone with the CDL help desk, once you hold a Mississippi license and a CDL learner’s permit for the class you’re testing in. On the day, bring the permit, your application, a valid medical card, a licensed driver with the same class or higher, and a vehicle that fits the class with its insurance and registration.

Six months. A Mississippi CDL itself is issued for five years.

Fingerprinting and the security check go through TSA’s Universal Enrollment Services centers, not Driver Service Bureau stations. Enroll before your knowledge test to save time, and start a renewal at least 60 days before your CDL expires.

Mississippi Department of Public Safety, Driver Service Bureau lists the current fees for the commercial learner permit, the CDL tests and the license on its official fee page.

Yes: call the driver license station where it's booked at least 48 hours ahead. The Department of Public Safety may also cancel for bad weather or a staff shortage. You can book before finishing entry-level training, but the test is cancelled if the training isn't done by then. Mississippi also lists third-party testers.

A completed, signed application, an original birth certificate or another accepted document, your Social Security card or an official government letter showing all nine digits, two proofs of residency, papers for any name change, and a medical card, which is valid for up to two years.

Electronically only. Mississippi no longer takes paper or scanned medical certificates at its stations or through its old online form. Your FMCSA-certified examiner sends the results to the National Registry, and Mississippi posts them to your driver record from there. Allow about 48 hours after the exam before you apply.

The CDL is suspended for one year. A regular Class R license gets 90 days for a first refusal, so holding a CDL makes the penalty much longer. Mississippi sets the suspension by the license status on your record at the time of the offense.

No. Mississippi's non-adjudication program, where a court holds back a DUI judgment while you complete its conditions, is closed to anyone who held a CDL or a commercial learner permit when the offense happened. For everyone else it can be used only once.

No. Mississippi allows one active credential: a CDL or a regular Class R license. If your CDL is suspended over a DUI or an implied-consent violation, you may surrender it and drop to Class R, but the CDL suspension keeps running and you can't hold a valid CDL until it ends.

Mississippi downgrades the CDL. Getting commercial privileges back is a separate CDL medical downgrade reinstatement, and that reinstatement can be paid only at a CDL driver license station, not at a regular office or online.

Yes, for driving within Mississippi, through the state's intrastate insulin-dependent commercial license. Ask the Department of Public Safety for its application package; headquarters reviews it and sends an approval letter, and first-time applicants can't start any testing until that letter arrives. Self-employed and unemployed drivers don't qualify.

Only a Department of Public Safety CDL examiner; third-party testers aren't accepted for first-time insulin-dependent applicants. A driver renewing an existing CDL can't renew until the approval letter comes, but may drop to a regular license of a lower class instead.

The driver must use a portable glucose monitor with downloadable memory, and the employer gets the maker's software. DPS inspects the employer every six months without warning, checking route logs, readings taken before and during driving, and the current medical certification with the endocrinologist's report. If the rules aren't followed, the license is suspended without notice.

21 for a CDL you can use across state lines. A driver under 21 can be issued a commercial license only with restriction F, which limits driving to within Mississippi, and no one under 21 can get the hazmat endorsement.

Missing the appointment, or arriving more than 15 minutes late, means a two-week wait before you can book again. A failed road test, on the other hand, has no waiting period: you can book the next open slot.

Yes, within two years. If you downgraded to a regular license or let the CDL expire, you can reapply for your old class and endorsements without new tests as long as no more than two years have passed. Hazmat is the exception: you take its test again.

Yes. If you took a non-commercial license in another state and then return, you can get back only the class you surrendered for that license. To drive commercially again you first get a Mississippi license, then take every required CDL test.

Not if you act within 24 months. A CDL holder suspended for unpaid child support can have the CDL reinstated without retesting within 24 months of the suspension date in the DPS notice. After that, you must pass the commercial driving test again.

No. Commercial vehicles are kept off the Natchez Trace Parkway, the National Park Service road that runs about 350 miles through Mississippi, and access points are limited. Plan truck routes on state and U.S. highways instead.

At least 300 feet outside business and residential districts. Mississippi bars a truck, truck-trailer or similar vehicle from following another truck more closely than that on open roads; the only exception is while you are actually passing it.

When an open-topped truck or trailer carries sand, dirt, gravel, rocks or similar material, or the load comes within six inches of the top of the bed. You then need a tarp or other cover tied down so nothing flaps, plus four six-inch sideboards raised and secured after loading.

Width, load included, is 8½ feet and height 13½ feet. A single vehicle may be 40 feet long, a semitrailer or trailer 53 feet, and each trailer in a double combination 30 feet. No combination may tow more than two units behind the towing vehicle.

Yes, if it is a third-party tester certified by the Department of Public Safety. The Driver Service Bureau publishes the list, mostly community colleges, truck driving schools and some employers, and each tester's instructor certificate must be renewed every year. Insulin-dependent first-time applicants still test with a DPS examiner.