Mississippi CDL Practice Test 2025

Mississippi CDL holders operating a commercial motor vehicle are subject to a 0.04% BAC DUI threshold — half the standard adult limit of 0.08%. Mississippi uses DUI (Driving Under the Influence) terminology. A first DUI conviction at the CMV threshold results in a mandatory one-year CDL disqualification (three years if hauling hazardous materials). A second DUI conviction results in lifetime CDL disqualification. Importantly, a DUI in a personal vehicle also triggers CDL disqualification under FMCSA regulations — the offense does not have to occur in a commercial vehicle.

Mississippi House Bill 1283, effective January 1, 2025, applies to CDL holders operating commercial vehicles just as it applies to all other drivers. Holding a handheld electronic device while driving a CMV is a primary offense under Mississippi law. Under FMCSA regulations, using a handheld mobile phone in a CMV is classified as a 'serious traffic violation.' A CDL holder with two serious traffic violations within three years faces a 60-day CDL disqualification; three within three years results in 120-day disqualification. The compounded state and federal consequences make HB 1283 violations particularly significant for CDL holders.

Oversized or overweight loads crossing Mississippi River bridges in Mississippi — including the I-20 bridge at Vicksburg, the US-84 bridge at Natchez, and the US-82 bridge near Greenville — require Mississippi Department of Transportation (MDOT) oversize/overweight permits that specifically authorize the bridge crossing. Bridge permits are separate from standard oversize corridor permits. CDL drivers must carry the permit in the vehicle, comply with any escort vehicle, lighting, and travel time requirements specified in the permit, and must not exceed the authorized dimensions or weight. MDOT's Permit Office issues these permits and maintains a database of bridge restrictions.

Mississippi's primary CDL freight corridors are I-20 (east-west through Jackson and Vicksburg — major freight link between Texas and the Southeast), I-55 (north-south connecting Memphis, Jackson, and Hammond, LA — a primary food distribution and retail freight corridor), US-49 (connecting the Gulf Coast port at Gulfport with I-20 at Hattiesburg/Magee), and US-61 (the historic Delta highway connecting Natchez to Memphis along the Mississippi River). I-10 serves the Gulf Coast corridor from Pascagoula to the Louisiana border. Understanding these corridors, their rest area locations, weigh station positions, and weather vulnerability (I-10 and US-49 during hurricane season) is important for Mississippi CDL operators.

The Mississippi Delta is one of the most intensively farmed agricultural regions in the United States, producing cotton, soybeans, corn, rice, and catfish — as well as being a major poultry production area. CDL operations in the Delta include grain truck operations during corn and soybean harvest (August–November), cotton module trucks transporting harvested cotton modules from fields to gins, poultry live-haul operations (which require special biosecurity protocols and may have weight permit requirements), and anhydrous ammonia transport for fertilizer application (requiring hazardous materials endorsement). Delta secondary roads are subject to spring weight restrictions and may flood during periods of high Mississippi River levels, requiring CDL operators to plan alternate routes.

A Class A CDL allows you to operate any combination of vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 lbs or more, provided the towed unit exceeds 10,000 lbs — this includes tractor-trailers and double/triple trailer rigs. A Class B CDL covers single vehicles with a GVWR of 26,001 lbs or more, or any such vehicle towing a unit not exceeding 10,000 lbs — this includes straight trucks and large buses. A Class C CDL is required for vehicles designed to carry 16 or more passengers (including the driver) or for vehicles transporting hazardous materials that require placarding, when those vehicles do not qualify for Class A or B.

CDL fees vary by state and by the class and endorsements you obtain. Most states charge separate fees for the CDL knowledge test ($10–$30 per attempt), the CDL skills test ($50–$150), and the CDL license itself ($50–$100). Additional fees apply for each endorsement (HazMat, Tanker, Passenger, etc.). The HazMat endorsement also requires a TSA security threat assessment fee of approximately $86. Check your Mississippi DMV website for current fee schedules.

Federal regulations (49 CFR 383.133) require that CDL applicants be able to read and speak the English language sufficiently to understand highway traffic signs and signals and to respond to official inquiries. Many states offer CDL knowledge tests in Spanish and other languages for non-commercial knowledge questions, but the actual CDL test must be taken in a language that allows the driver to meet the English proficiency requirement. Check with the Mississippi DMV for available language options.

In most states, a CDL is valid for 4–8 years (commonly 4–5 years). To renew your Mississippi CDL, you typically need to visit a DMV office, pass a vision test, pay the renewal fee, and update your medical certification (DOT physical). If you hold a HazMat endorsement, your TSA background check must also be current. CDLs cannot generally be renewed online due to federal requirements for in-person verification of medical certification.

If you fail the CDL General Knowledge test in Mississippi, you are typically required to wait a specified period (commonly 1–7 days) before retaking it. Most states allow 2–3 attempts before requiring additional waiting periods or study requirements. There is usually a retest fee for each attempt. Focus on the areas you missed — most states provide a score sheet showing which topic areas you need to review.