Iowa CDL Practice Test

Correct answer: 18 years old

Iowa’s requirements to obtain a CDL start with being at least age 18. Age 18 CDLs are restricted to intrastate driving (an Iowa-only "K" restriction); you must be 21 to drive a commercial vehicle in interstate commerce.

Correct answer: $12

The Iowa CLP costs $12. You are issued the CLP after you pass the required knowledge test(s), and it lets you practice driving a commercial vehicle when accompanied by a qualified CDL holder.

Correct answer: One year from the date of issuance, with no renewal period

An Iowa CLP is valid for one year from the date of issuance, with no renewal period. If it expires before you obtain your CDL, you must start over with a new permit.

Correct answer: Not until you have held the CLP for at least 14 days

You must hold the CLP for at least 14 days before the skills test can be completed — you cannot test in the first 14 days after issuance. You may schedule the skills test when the CLP is issued, as long as the appointment is 15 or more days out.

Correct answer: Accompanied by a driver who holds a CDL valid for the same type of vehicle

A CLP lets you drive a commercial vehicle specific to your CLP type only when accompanied by another driver who holds a CDL valid for that same type. You may not drive a commercial vehicle by yourself, carry passengers (other than trainees, examiners, and the accompanying CDL holder), or use a cell phone while driving.

Correct answer: Intrastate only — no operating a commercial vehicle in interstate commerce

The "K" restriction means Intrastate only. It applies to a driver who self-certifies to intrastate driving and prohibits operating a commercial vehicle in interstate commerce. Drivers ages 18–20 hold an intrastate-only CDL until they turn 21.

Correct answer: Has a GVWR of 26,001+ lbs, is designed to carry 16+ people (including the driver), or hauls placardable hazmat

Iowa defines a CMV as a vehicle (or combination) with a GVWR/GCWR of 26,001 or more pounds, OR one designed to transport 16 or more passengers including the driver, OR one used to transport a placardable amount of hazardous materials. Any of these triggers the CDL requirement.

Correct answer: A farmer operating a properly identified covered farm vehicle

Iowa’s CDL exemptions include a farmer (or a person working for a farmer) operating a covered farm vehicle, active-duty military operating DoD equipment, firefighters and peace officers on emergency duty, recreational-vehicle operators, and in-home care aides. Freight haulers and large passenger buses still need a CDL.

Correct answer: Does not permit operating triple trailers in Iowa — but an Iowa driver may hold the T endorsement to haul them where they are legal

Iowa law does not permit the operation of triple trailers within the state. However, a driver whose home state is Iowa may still obtain the doubles/triples (T) endorsement to haul a triple trailer in jurisdictions where they are legal.

Correct answer: By failing the air brake portion of the knowledge test, or testing in a vehicle without air brakes

The "L" restriction prohibits operating a commercial vehicle equipped with air brakes. It is applied to a licensee who either fails the air brake component of the knowledge test or performs the skills test in a vehicle not equipped with air brakes.

Correct answer: People who cannot see others may move into your path without knowing you are there

People who cannot see others are a very dangerous hazard. Watch for vans, loaded station wagons, rental trucks whose drivers are not used to limited vision, and in winter, vehicles with frosted, ice-covered, or snow-covered windows.

Correct answer: Assume the driver cannot see you and be prepared to stop

If you can only see the rear or front of a vehicle but not the driver, then the driver cannot see you. Be alert — the vehicle may back out or pull into your lane — and always be prepared to stop.

Correct answer: Movement inside the vehicle, brake lights, backup lights, or exhaust

Parked vehicles become hazards when people start to get out or the vehicle suddenly pulls away. Watch for movement inside the vehicle, brake lights, backup lights, exhaust, and other clues that a driver is about to move.

Correct answer: Packages or open doors can block the driver’s vision, and drivers in a hurry may suddenly step out

Packages or vehicle doors often block a delivery driver’s vision. Drivers of step vans, postal vehicles, and local delivery vehicles are often in a hurry and may suddenly step out or pull into the traffic lane.

Correct answer: They may have their back to traffic or wear headsets, hats, or umbrellas and not see or hear you

Walkers, joggers, and bicyclists may be on the road with their back to traffic and cannot see you; some wear headsets and cannot hear you. On rainy days, hats and umbrellas block their view and they may hurry without watching traffic.

Correct answer: They tend to act quickly without checking traffic

Children tend to act quickly without checking traffic. Children playing with one another may not look, and someone selling ice cream is a hazard clue that children may be nearby and may not see you.

Correct answer: They often are not watching for traffic and may step or run into the road

People changing a tire or involved in an accident often do not pay attention to roadway traffic. Passing drivers stare at the scene, people run across the road without looking, and vehicles slow or stop suddenly.

Correct answer: Sudden changes of direction or stopping, hesitation, or out-of-state plates near an interchange

Confused drivers change direction suddenly or stop without warning, common near interchanges and major intersections. Clues to tourists include car-top luggage and out-of-state plates; hesitation and frequent braking are clues to confusion.

Correct answer: The vehicle ahead is a slow-moving hazard, such as farm or construction machinery

Motorists who fail to keep up normal speed are hazards. Some vehicles are slow by nature — mopeds, farm machinery, tractors — and may display the slow-moving-vehicle symbol, a red triangle with an orange center. Watch for it.

Correct answer: Weaving across the road, stopping at the wrong time, or an open window in cold weather

Clues to impaired drivers include weaving or drifting, dropping wheels onto the shoulder, stopping at the wrong time (such as at a green light), an open window in cold weather, and suddenly speeding up or slowing down. Be especially alert late at night.