Free South Dakota CDL Practice Test (2026)
Study for the South Dakota CDL knowledge tests with lessons on General Knowledge, Air Brakes, Combination Vehicles and Hazmat. Instant feedback, repeat-until-right practice and a timed 50-question simulation.
South Dakota CDL test at a glance
Commercial driver licensing follows federal FMCSA rules, so the South Dakota CDL knowledge tests cover the same CDL manual topics used nationwide. Federal rules require a score of at least 80% on each knowledge test. After passing, you get a Commercial Learner's Permit (CLP) and must hold it at least 14 days before the skills test. First-time Class A and B applicants must also complete Entry-Level Driver Training (ELDT) from a registered provider.
Tip: Start with General Knowledge: every CDL applicant takes it. Then add Air Brakes and Combination Vehicles if you want a Class A.
How this practice test works
- Learn: each module starts with short lessons on one topic.
- Practice 5 questions: tap an answer to see right away if it is correct, with an explanation.
- Fix your mistakes: missed questions come back until you get them right.
- Move to the next module, then take the timed simulation and review every mistake.
Topics covered
- General Knowledge: inspections, space and speed management, hazards
- Air Brakes: system parts, checks and stopping distance
- Combination Vehicles: coupling, uncoupling and rollover risks
- Hazardous Materials: placards, shipping papers and loading
- Cargo securement and weight
- Driving in bad weather, mountains and at night
- Railroad crossings and emergencies
Frequently asked questions
How many questions are on the South Dakota CDL General Knowledge test?
The General Knowledge test is usually 50 questions. Endorsement tests are shorter. Confirm the current format in the South Dakota CDL manual.
What score do I need to pass the CDL test?
Federal rules (49 CFR 383.135) require at least 80% on each knowledge test.
How old do you have to be to get a CDL?
You must be 21 to drive commercial vehicles across state lines. Many states allow intrastate CDLs at 18.
How long must I hold a CLP?
At least 14 days before you can take the CDL skills test.
What is ELDT?
Entry-Level Driver Training is required by FMCSA for first-time Class A and B CDLs and for some upgrades and endorsements. Training must come from a provider on the FMCSA Training Provider Registry.
More South Dakota tests
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Official sources
- Official South Dakota driver handbook
- South Dakota Driver Licensing Program
- FMCSA: Commercial Driver's License program
- FMCSA Training Provider Registry (ELDT)
Information checked in September 2026 against official FMCSA and South Dakota Driver Licensing Program sources. Rules change, so always confirm with the official South Dakota manual and the South Dakota Driver Licensing Program. PracticePermit.us is not affiliated with any government agency.
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