South Dakota Pre Trip Inspection Test
From the icy grades of I-90 near Spearfish to the grain haulers on I-29, you need to know your truck inside and out to pass the SD pre-trip.
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Pre Trip Inspection test for South Dakota Class A and B CDL. 25 questions, 80% to pass, 30 minutes.
Key Topics
- •Air brakes
- •Lights and signals
- •Coupling and fifth wheel
About the South Dakota Pre Trip Inspection Test
Topics Covered
- ✓Air brake system inspection – South Dakota winter temperatures can freeze moisture in air lines; you need to check for ice buildup and proper drainage to avoid brake failure.
- ✓Coupling systems – Grain trailers on I-29 need secure fifth wheel connections to handle crosswinds; SD examiners watch for loose jaws or worn kingpins.
- ✓Lights and reflectors – Long stretches of rural highways at night require all lights working for visibility; a burned-out marker light can fail you on the skills test.
- + 3 more topics
📘 Study Tips & State Info
Here's what SD examiners actually watch for. First, they want a solid walk-around pattern. Start at the front, go clockwise, and don't skip anything. Say each item out loud — 'checking for cracks, leaks, and security.' They're listening for those exact phrases. If you mumble or skip around, they'll think you're guessing.
Second, nail the air brake check. You'll get questions about low air warning devices, governor cut-out pressure, and air loss rate. Memorize the numbers: 60 psi for low air warning, 100-125 psi for cut-out, and no more than 3 psi loss per minute with engine off. SD examiners drill this because they've seen too many drivers skip the pre-trip and end up with failed brakes on a hill.
Third, know your emergency equipment. South Dakota law requires three reflective triangles, a fire extinguisher, and spare fuses. They'll ask where you keep them and how to set them up. On a real test, you might have to demonstrate. Study the manual's diagrams for triangle placement on two-lane roads versus interstates — that's a common trick question.
South Dakota CDL testing is handled by the Department of Public Safety (DPS) at driver exam stations. Major locations include Pierre (headquarters), Rapid City, Sioux Falls, Aberdeen, and Mitchell. You'll need an appointment for the written test — walk-ins are sometimes accepted but not guaranteed. Call ahead. The fee for the Pre Trip Inspection written test is $40, same as other knowledge tests. You'll also need to show a valid Medical Examiner's Certificate (DOT physical) when you test.
South Dakota allows third-party testing at some accredited trucking schools. If you go that route, the school's test is valid for your CDL skills exam, but the written tests must still be taken at a DPS office. Make sure your vehicle passes a basic safety inspection before you show up — no leaks, all lights working, tires good. The DPS will check it before they let you take the skills test.
One unique thing: South Dakota doesn't require a separate pre-trip inspection written test for every endorsement. If you're getting a Class A with tanker and hazmat, you only take the Pre Trip Inspection test once. But if you fail, you have to wait one business day before retaking it. No same-day retakes in SD.
About the South Dakota Pre Trip Inspection Test
South Dakota's roads aren't forgiving. You're hauling grain down I-29 in a blizzard or running cattle through the Black Hills on US-16, and your rig better be tight. The Pre Trip Inspection written test makes sure you know what to check before you roll. The SD DPS expects you to understand every system on that truck — not just for the paper test, but for the real-world conditions you'll face out here.
The test covers the same federal standards as everywhere else, but South Dakota examiners have their own focus. They've seen too many trucks lose brakes on a downgrade near Sturgis or blow a tire on a gravel county road. That's why they hammer on air brake inspections, lighting, and coupling security. You'll get 25 multiple-choice questions and 30 minutes to finish. You need 20 right to pass — 80%.
Winter here is no joke. If you don't check your air dryer and drain your tanks, moisture freezes and locks up your brakes. Summer's not much better — grain dust can hide a cracked rim or a frayed belt. The pre-trip written test forces you to learn the inspection sequence cold. Then when you do the hands-on pre-trip for your skills exam, you'll already know the drill.
Most SD CDL offices — Pierre, Rapid City, Sioux Falls — use the same test bank. The questions come straight from the South Dakota CDL Manual. Study that manual, not some generic guide. And pay attention to the air brake section. That's where most students slip up.
Topics Covered
Study Tips
Here's what SD examiners actually watch for. First, they want a solid walk-around pattern. Start at the front, go clockwise, and don't skip anything. Say each item out loud — 'checking for cracks, leaks, and security.' They're listening for those exact phrases. If you mumble or skip around, they'll think you're guessing.
Second, nail the air brake check. You'll get questions about low air warning devices, governor cut-out pressure, and air loss rate. Memorize the numbers: 60 psi for low air warning, 100-125 psi for cut-out, and no more than 3 psi loss per minute with engine off. SD examiners drill this because they've seen too many drivers skip the pre-trip and end up with failed brakes on a hill.
Third, know your emergency equipment. South Dakota law requires three reflective triangles, a fire extinguisher, and spare fuses. They'll ask where you keep them and how to set them up. On a real test, you might have to demonstrate. Study the manual's diagrams for triangle placement on two-lane roads versus interstates — that's a common trick question.
South Dakota Specific Information
South Dakota CDL testing is handled by the Department of Public Safety (DPS) at driver exam stations. Major locations include Pierre (headquarters), Rapid City, Sioux Falls, Aberdeen, and Mitchell. You'll need an appointment for the written test — walk-ins are sometimes accepted but not guaranteed. Call ahead. The fee for the Pre Trip Inspection written test is $40, same as other knowledge tests. You'll also need to show a valid Medical Examiner's Certificate (DOT physical) when you test.
South Dakota allows third-party testing at some accredited trucking schools. If you go that route, the school's test is valid for your CDL skills exam, but the written tests must still be taken at a DPS office. Make sure your vehicle passes a basic safety inspection before you show up — no leaks, all lights working, tires good. The DPS will check it before they let you take the skills test.
One unique thing: South Dakota doesn't require a separate pre-trip inspection written test for every endorsement. If you're getting a Class A with tanker and hazmat, you only take the Pre Trip Inspection test once. But if you fail, you have to wait one business day before retaking it. No same-day retakes in SD.