Knowledge Test Class B #1
Class B Driving Test | Iowa 2026 #1 Page 3 of 7
Train for FREE online with our Iowa class B license test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a IA CDL class B permit in 2026, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that CDL class B requirements may vary from state to state.
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15 . How soon after starting a trip must cargo securement be checked?
Cargo should be inspected before beginning a trip, within the first 50 miles of the trip, and every three hours or 150 miles traveled thereafter. The driver of a truck transporting cargo is responsible for the cargo being safely secured throughout the trip.
16 . When in heavy traffic, the safest driving speed is:
In heavy traffic, it is safest to travel at the same speed as other vehicles. If two vehicles continue to drive in the same direction at the same speed, they cannot hit each other.
17 . If exiting a bus, a driver must:
When exiting your vehicle during the basic vehicle control skills test, you must face the vehicle and maintain three points of contact at all times. If your testing vehicle is a bus, you must maintain contact with the handrail. Exiting the vehicle incorrectly may result in automatic failure of the basic vehicle control skills test.
18 . Distracted driving can be avoided by:
Distractions while driving can be physical (such as reaching for an object), mental (such as making conversation with a passenger), or both (such as holding a phone to send texts). Strategies to help you avoid distracted driving include pre-programming radio stations; planning out your route in advance; avoiding complex or emotionally taxing conversation while driving; adjusting your mirrors before setting out; and not eating, drinking, or smoking while behind the wheel.
19 . What helps prevent wheel lockup when braking?
The purpose of an Anti-Lock Braking System (ABS) is to prevent wheel lockup while brakes are being applied.
20 . What is often found in compressed air?
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.
21 . If a five-foot-long item is placed on a flatbed trailer, it must be secured by at least:
Cargo that is required to be tied down should be secured by at least one tie-down for every 10 feet of cargo length. However, at least two tie-downs should be used no matter how small the cargo is.
See the exact questions that will be on the 2026 Iowa DMV exam.
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2026 Iowa | Frequently Asked Questions
To acquire a CDL Passenger endorsement in Iowa, you must already possess a valid Commercial Driver's License (CDL). Then, you'll need to pass the Passenger Vehicles endorsement written test. Study the Iowa CDL Manual's section on passenger vehicles. After passing the test, pay the required fee to add the endorsement to your CDL.
To obtain a CDL Passenger license in Iowa, you must be at least 21 years old, hold a valid CDL, and pass a Passenger Vehicles endorsement written test. You must also have a clean driving record, pass a physical exam every two years, and complete an application with the Iowa Department of Transportation. Additionally, you'll need to pass a background check if transporting children.
While specific training isn't required by law in Iowa to secure a CDL Passenger endorsement, gaining practical experience is beneficial. Many choose to attend a professional truck driving school. You must, however, pass the Passenger Vehicles endorsement written test, which covers topics like inspecting passenger vehicles, loading, and on-the-road safety. Studying the Iowa CDL Manual's passenger vehicles section helps in preparation.
Yes, in addition to holding a valid Commercial Driver's License (CDL), securing a CDL Passenger endorsement in Iowa requires passing the Passenger Vehicles endorsement written test. This test covers topics such as inspecting passenger vehicles, loading, trip start and end procedures, and on-the-road safety. No additional driving tests are required unless upgrading the class of your CDL.
The CDL Passenger endorsement assessment in Iowa primarily involves a written test, not a driving test. The written test covers topics like inspecting passenger vehicles, loading and unloading passengers, safe operation, and emergency procedures. However, if you're upgrading your CDL class, a skills test involving vehicle inspection, basic controls, and on-road driving may be required.
No, you cannot legally transport passengers in Iowa without a valid CDL Passenger endorsement. This endorsement is required for drivers who wish to drive any vehicle designed to transport 16 or more passengers, including the driver. Driving without the necessary endorsement can lead to serious penalties, including fines and potential loss of your commercial driving privileges.
Yes, you can add a CDL Passenger endorsement to your existing Commercial Driver's License in Iowa. You don't need to apply for a new license. However, you must pass the Passenger Vehicles endorsement written test. Once you pass the test, the endorsement will be added to your current CDL.
Yes, there are specific restrictions for drivers with a CDL Passenger endorsement in Iowa. These include strict adherence to safety regulations, such as not overloading the vehicle beyond its capacity, ensuring all passengers wear seat belts, and following specific rules for transporting school-aged children. Additionally, drivers with this endorsement cannot have a blood alcohol concentration of 0.04% or higher while operating a commercial vehicle.
Yes, there are age-related prerequisites for obtaining a CDL Passenger endorsement in Iowa. The minimum age to apply for a commercial driver's license (CDL) in Iowa is 18. However, to drive a commercial vehicle across state lines or to carry hazardous materials, you must be at least 21 years old. Always check with the Iowa Department of Transportation for the most current rules and regulations.
With a CDL Passenger endorsement in Iowa, you'll be eligible to operate vehicles such as buses, shuttles, and vans designed to carry 16 or more passengers, including the driver. This includes school buses, city buses, and commercial buses. However, for school buses, an additional School Bus (S) endorsement is required.
