South Dakota CDL Practice Test 2025

Two major Black Hills roads are specifically prohibited for standard CDL combination vehicles. The Needles Highway (SD-87) has tunnel clearances of only 8'4" in height and 8'9" in width — no standard commercial combination vehicle can fit through these tunnels. Iron Mountain Road (US-16A) has rock tunnel clearances of 12'4" and Pigtail Bridges that restrict vehicle length due to tight curves. CDL drivers delivering to Custer State Park, Mount Rushmore, and nearby Black Hills destinations must use US-16, SD-244, or other alternate routes with standard clearances.

I-90 crosses South Dakota east to west from the Minnesota border to Wyoming, passing through Sioux Falls, Mitchell, Chamberlain, Rapid City, and Sturgis. It is South Dakota's primary freight corridor and has an 80 mph speed limit. CDL drivers must manage significant wind exposure on the open plains of central South Dakota, crossing the Missouri River at Chamberlain (bridge can have significant crosswinds for high-profile vehicles), and Black Hills grades approaching Rapid City. Winter operations require reduced speeds and SDDOT road condition monitoring.

The Sturgis Motorcycle Rally (first full week of August) creates major disruptions for CDL delivery operations throughout the Black Hills. Traffic volumes can increase by 300-500% in the Sturgis and surrounding area. CDL carriers should plan deliveries for early morning (before 7 AM when possible), verify current routing restrictions with local law enforcement, expect delivery times to be significantly longer, and coordinate with customers on flexible delivery windows. Some roads in Sturgis proper may have temporary restrictions on commercial truck access during peak rally hours.

South Dakota's oversize/overweight permits are issued by the South Dakota Department of Transportation. Permit requirements include specified routes (which avoid restricted Black Hills roads), travel time restrictions (often daylight hours only), escort vehicle requirements for very wide or long loads, and maximum speed limits. South Dakota also issues seasonal agricultural overweight permits during harvest for grain transport on designated routes. CDL drivers must carry the permit in the vehicle at all times and comply with all conditions — violations can result in significant fines and CDL compliance issues.

South Dakota's economy drives demand for several CDL endorsements. The Combination (Class A) CDL covers most freight operations on I-90 and I-29. The Tank (N) endorsement is needed for liquid transport including fuel delivery (especially to rural ranch operations and Black Hills resorts). The HazMat (H) endorsement covers fuel and chemical transport. The Doubles/Triples (T) endorsement is used on I-90 for long-haul freight. Agricultural commodity transport (grain, livestock) typically requires a standard Class A or Class B CDL depending on vehicle configuration.

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 South Dakota 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 South Dakota DMV for available language options.

In most states, a CDL is valid for 4–8 years (commonly 4–5 years). To renew your South Dakota 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 South Dakota, 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.