Knowledge Test Class B #2
Class B Driving Test | Iowa 2026 #2 Page 2 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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8 . Mirrors should be:
When driving, you should regularly check your mirrors, both to be aware of traffic and to check for problems on your own vehicle.
9 . Rough acceleration:
Always speed up smoothly and gradually so that your vehicle does not jerk. Rough acceleration can cause mechanical damage.
10 . You may:
A person cannot have more than one driver license at a time. States share information through a computer database to ensure that no person has more than one license. Violation of this law could result in fines or jail time.
11 . When driving in hot weather:
Because air pressure increases as air expands in the heat, it is important to monitor your tire pressure when driving in very hot weather. To prevent the engine from overheating, there must be an adequate amount of oil in the engine, as well as enough water and antifreeze in the cooling system. Antifreeze is helpful for the engine in both hot and cold weather.
12 . How much distance will an air brake-equipped vehicle need to come to a complete stop if it is traveling at 55 mph under ideal driving conditions?
A vehicle's total stopping distance is made up of perception distance, reaction distance, brake lag distance, and braking distance. With all of these factors included, an air brake-equipped vehicle traveling at a speed of 55 mph under ideal driving conditions will need approximately 450 feet to come to a complete stop.
13 . When driving, being aware of what is happening behind you is:
When driving, it is important to be aware of what is happening behind and to the sides of your vehicle. Mirror checks and head checks should be a normal part of your scanning routine.
14 . 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.
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.