Missouri CDL Practice Test

Correct answer: 50 questions

Missouri publishes its live written-exam counts: General Knowledge is 50 questions, Air Brake is 25, and Combination Vehicle is 20. You must score 80% on each exam to pass.

Correct answer: 80%

Missouri requires 80% on every CDL written exam — General Knowledge, Air Brake, Combination, and any endorsement tests. Missouri written exams are available at all Highway Patrol testing locations.

Correct answer: 18 years old

You must be at least 18 to apply for a Missouri CLP, and you must also have passed the written, road sign, and vision tests. A CLP applicant must already hold a valid Missouri base driver license.

Correct answer: One year (360 days) or less, and it cannot be renewed

A Missouri CLP is issued for one year (360 days) or a lesser term based on lawful-status eligibility, and it cannot be renewed. If you need more training after it expires, you must retest for a new permit.

Correct answer: $10.00

The Missouri CLP fee is $10.00 for its one-year (360-day) term. The separate CDL written test fee and the CDL skills test fee are each $25.00, and a full CDL is $20.00 for a term of three years or less.

Correct answer: A CDL holder valid for that vehicle sits beside you to give instruction

A Missouri CLP lets you operate a CMV only when accompanied by the holder of a CDL valid for the vehicle being driven, who occupies the seat beside you (or reasonably near you on a bus) to give instruction in driving it.

Correct answer: Only within Missouri (intrastate) until age 21

Missouri sets CDL eligibility at 18 years for intrastate driving (within Missouri) and 21 years for interstate driving if otherwise eligible. Drivers under 21 are limited to intrastate operation.

Correct answer: Intrastate driving only — no operation outside Missouri or in interstate commerce

The K restriction limits the driver to intrastate driving only: the person may not operate a commercial motor vehicle outside Missouri or in interstate commerce. It is placed on the CDL of a driver who certifies intrastate status.

Correct answer: An FMCSA-approved Entry-Level Driver Training (ELDT) program

FMCSA-approved ELDT is required before skills testing for a first-time CDL, a first-time hazmat/passenger/school-bus endorsement, or a class upgrade. Missouri examiners deny the skills test if ELDT completion cannot be confirmed electronically. Test prep like this app is not a substitute for ELDT.

Correct answer: English only — no interpreter is allowed

Missouri commercial license examinations are administered only in English, and an interpreter is not allowed for any portion of the CDL written or skills examinations.

Correct answer: Never do this — you could cause a crash and be held responsible

Do not direct traffic. If you signal another driver that it is safe to pass and you are wrong, you could cause a crash, be blamed for it, and it could cost you many thousands of dollars.

Correct answer: Assume they do not see you, and when legal tap the horn or flash your lights

Assume they do not see you — they could suddenly move into your path. When it is legal, tap the horn lightly or, at night, flash your lights from low to high and back. Drive carefully enough to avoid a crash even if they never notice you.

Correct answer: Turn on your headlights, using the low beams

When it is hard to see, turn on your headlights — the low beams, not just the identification or clearance lights. High beams can bother other drivers in the daytime as well as at night.

Correct answer: Turn on your four-way emergency flashers

When parked at the side of the road, turn on the four-way emergency flashers — this is important at night. Do not trust the taillights: drivers have crashed into parked vehicles thinking they were moving normally.

Correct answer: At 10 feet, 100 feet, and 200 feet toward the approaching traffic

On or by a one-way or divided highway, place the warning devices 10 feet, 100 feet, and 200 feet toward the approaching traffic. You must put out your warning devices within ten minutes of stopping.

Correct answer: Within 10 feet of the vehicle, and 100 feet behind and ahead of it

On a two-lane, two-way road or undivided highway, place one triangle within 10 feet of the front or rear corners, and one 100 feet behind and one 100 feet ahead of the vehicle, on the shoulder or in the lane you stopped in.

Correct answer: Move it farther back down the road so drivers get warning within 500 feet

Back beyond any hill, curve, or obstruction that keeps drivers from seeing the vehicle within 500 feet, move the rear-most triangle to a point back down the road so warning is provided before drivers reach the obstruction.

Correct answer: Between yourself and the oncoming traffic, so drivers can see you

Hold the triangles between yourself and the oncoming traffic for your own safety, so that other drivers can see you as you place them.

Correct answer: Use it when needed, but know it can startle others and be dangerous if used unnecessarily

Your horn can let others know you are there and help avoid a crash. Use it when needed — but it can startle others and could be dangerous when used unnecessarily.

Correct answer: At least one second for each 10 feet of vehicle length

One good rule: at speeds below 40 mph, allow at least one second for each 10 feet of vehicle length. So a 40-foot vehicle needs 4 seconds and a 60-foot rig needs 6 seconds of following distance.