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Free South Dakota CDL practice test online

Take a free South Dakota CDL practice exam online with clear explanations—no sign-up. Coverage includes general knowledge, vehicle systems, combination vehicles, cargo, and endorsements. Then verify current requirements with South Dakota Driver Licensing.

South Dakota Driver Licensing gives the general knowledge test as 50 questions, and federal law sets the bar at 80% correct on every knowledge test. You must also hold a commercial learner’s permit for 14 days before the skills test.

Start practice Exam-style run

New to the knowledge test? CDL endorsements explained · One-week study plan

Practice coverage
Complete a run to establish your baseline.
600questions
23topics
80%federal pass mark

49 CFR 383.135(a)(1) sets the CDL knowledge-test passing score at 80%. Reaching it here is not a prediction of your official result.

Requirements before you test

South Dakota CDL test requirements

50
General knowledge questions
South Dakota Driver Licensing
40 of 50
Correct to pass (minimum)
80% floor, 49 CFR 383.135(a)(1)
80%
Passing score
49 CFR 383.135(a)(1)
14 days
CLP held before skills test
South Dakota Driver Licensing
18
Min. age (in-state)
South Dakota Driver Licensing
21
Min. age (interstate)
49 CFR 391.11(b)(1)

Commercial licensing is largely federal. Any figure above credited to a 49 CFR section applies in every state — see 49 CFR 383.135(a)(1) and 49 CFR 383.25(e). A figure credited to South Dakota Driver Licensing is South Dakota’s own, and may be stricter than the federal floor. Test length, fees, and scheduling are set by South Dakota Driver Licensing (official source).

Entry-Level Driver Training comes first

Since February 7, 2022, a new Class A or Class B CDL, a class upgrade, or a first passenger, school bus, or hazardous materials endorsement requires training from a provider on the FMCSA Training Provider Registry (49 CFR 380.600). Practice questions are study material and do not satisfy that requirement.

FMCSA Training Provider Registry

You need a South Dakota licence first

A commercial learner’s permit only counts if you already hold an ordinary licence from the same state (49 CFR 383.25(a)(2)). The South Dakota non-commercial knowledge test runs 25 questions and needs 20 correct, with permits issued from age 14.

South Dakota permit practice test
Quick practice
10 balanced questions with feedback after every answer.
Practice now
Topic review
Focus on one knowledge area before returning to mixed practice.
See topics
Exam-style run
Answer the full starter bank before seeing your results.
Take the run

What you will practice

Build coverage topic by topic.

Each question carries a topic, difficulty, explanation, and source section so your review has context.

General knowledge29 reviewed questionsMountain driving12 reviewed questionsAir brakes61 reviewed questionsCombination vehicles54 reviewed questionsVehicle systems9 reviewed questionsCargo18 reviewed questionsTank vehicles47 reviewed questionsDoubles and triples43 reviewed questionsHazardous materials71 reviewed questionsSchool bus48 reviewed questionsPassenger vehicles45 reviewed questionsSafe driving6 reviewed questionsSpace management14 reviewed questionsVehicle inspection15 reviewed questionsEmergencies23 reviewed questionsHours of service14 reviewed questionsBasic control11 reviewed questionsSeeing hazards15 reviewed questionsWeather18 reviewed questionsNight driving7 reviewed questionsDriver fitness8 reviewed questionsSpeed management17 reviewed questionsCommunication15 reviewed questions

Sample questions

5 South Dakota CDL practice questions

Try these South Dakota sample questions now — each shows the correct answer with a plain-language explanation and a source section. The full 600-question bank is in the practice run.

  1. 1. Before moving after loading or unloading students, you must check:

    • All mirrors, including crossover mirrors, so the danger zone is clear
    • BOnly the interior rearview mirror
    • CNo mirrors if the stop arm is extended
    • DOnly the left outside mirror once

    Answer: All mirrors, including crossover mirrors, so the danger zone is clear. Count students and account for everyone before the bus rolls.

    Source: Commercial Driver License Manual — School buses — mirrors and loading

  2. 2. High crosswinds are especially dangerous for doubles and triples when the trailers are:

    • ACarrying liquid
    • BCoupled to a heavy tractor
    • CFully loaded
    • Empty or lightly loaded

    Answer: Empty or lightly loaded. A light trailer has little weight resisting the wind, so gusts can push it sideways or tip it. Slow down or stop in severe wind.

    Source: Commercial Driver License Manual — Doubles and triples — adverse conditions

  3. 3. If a school bus is stalled on or adjacent to a railroad-highway crossing, the driver must:

    • AKeep students on the bus and wait for the train
    • Evacuate the bus
    • CMove students onto the tracks away from traffic
    • DOnly call dispatch and remain seated

    Answer: Evacuate the bus. A stalled bus on the crossing is a mandatory evacuation situation.

    Source: Commercial Driver License Manual — School buses — mandatory evacuations

  4. 4. When you pull off the road and stop, turn on:

    • Four-way emergency flashers
    • BOnly the left turn signal
    • CNo lights if taillights work
    • DHigh beams aimed at traffic

    Answer: Four-way emergency flashers. Drivers have crashed into parked vehicles they thought were still moving, especially at night.

    Source: Commercial Driver License Manual — Communicating — when parked

  5. 5. Driving much faster than surrounding traffic generally:

    • AReduces crash risk
    • Increases passing and fatigue, raising crash risk
    • CIs required on interstates
    • DImproves fuel economy always

    Answer: Increases passing and fatigue, raising crash risk. Constantly passing is tiring and multiplies conflict points. Going with the flow is safer when conditions allow.

    Source: Commercial Driver License Manual — Driving safely — speed and traffic

Practice all 600 questions

CDL knowledge areas

Classes and endorsements, organized.

Each area below scopes the reviewed question bank to one knowledge test. The material is federal, so it applies in South Dakota just like everywhere else — the endorsement guide explains how the codes fit together.

General knowledge

The foundation for commercial driving: inspections, space, speed, communication, hazards, and safe operation.

  • Pre-trip inspection
  • Space and speed management
  • Railroad crossings
  • Emergency procedures
Practice general knowledge
Air brakes

Understand air-brake components, inspections, warning devices, stopping distance, and controlled braking.

  • Dual air systems
  • Low-air warnings
  • Brake lag and fade
  • Applied-leak and static checks
Practice air brakes
Combination vehicles

Prepare for safe coupling, inspection, turning, backing, and handling of tractor-trailer combinations.

  • Fifth-wheel inspection
  • Coupling and uncoupling
  • Off-tracking
  • Trailer skid prevention
Practice combination vehicles
Hazardous materialsEndorsement H

Study hazard communication, shipping papers, placards, loading rules, parking, and emergency response responsibilities.

  • Hazard classes
  • Placards and labels
  • Shipping papers
  • Loading and segregation
Practice hazardous materials
Tank vehiclesEndorsement N

Learn how liquid surge, outage, bulkheads, and high centers of gravity change vehicle handling.

  • Liquid surge
  • Outage requirements
  • Smooth braking
  • Rollover prevention
Practice tank vehicles
Doubles & triplesEndorsement T

Practice converter-dolly inspection, coupling order, rearward amplification, and stability principles.

  • Coupling sequence
  • Converter dollies
  • Rearward amplification
  • Space management
Practice doubles & triples
Passenger vehiclesEndorsement P

Prepare to inspect, load, and operate buses while keeping passengers, aisles, and exits safe.

  • Vehicle inspection
  • Passenger loading
  • Emergency exits
  • Prohibited practices
Practice passenger vehicles
School busEndorsement S

Review student loading, danger zones, mirrors, emergency procedures, and special railroad-crossing duties.

  • Danger zones
  • Student loading
  • Mirror use
  • Railroad crossings
Practice school bus
Official source hub
Verify current rules before your test.

QuizLane’s starter material points learners back to the agency responsible for licensing in South Dakota. Rules and manuals can change; the official agency remains authoritative.

Visit South Dakota Driver Licensing
Our accuracy promise
Original wording—not scraped competitor questions
A source section attached to every reviewed item
A correction path when something looks wrong
Read our methodology

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Common questions

What this practice can—and cannot—tell you.