Knowledge Test Class B #1
Class B Driving Test | Iowa 2025 #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 2025, 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 2025 Iowa DMV exam.
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2025 Iowa | Frequently Asked Questions
To secure a CDL Doubles/Triples endorsement in Iowa, you must first possess a valid Commercial Driver's License (CDL). Then, you need to pass the Doubles and Triples Endorsement Knowledge Test. This test covers the specifics of driving double and triple trailers, coupling and uncoupling, and inspecting doubles and triples. Remember, practice makes perfect.
To obtain a CDL Doubles/Triples license, you initially need a Commercial Driver's License (CDL). Then, you must pass the Doubles/Triples Endorsement Knowledge Test. The test covers topics like handling, coupling & uncoupling, and inspecting double and triple trailers. Studying the state's CDL manual and taking practice tests can help ensure success.
While Iowa doesn't specifically require specialized training to obtain a CDL Doubles/Triples endorsement, it's highly recommended. The endorsement requires passing a knowledge test on handling, inspecting, and coupling/uncoupling double and triple trailers. Studying the state's CDL manual and gaining practical experience through training programs can significantly improve your chances of passing the test.
Yes, to obtain a CDL Doubles/Triples endorsement, you are required to pass the Doubles/Triples endorsement knowledge test. This exam covers specific topics related to handling double and triple trailers, including coupling and uncoupling, inspecting doubles and triples, and pulling double/triple trailers. The test does not include a skills or driving test.
The CDL Doubles/Triples endorsement test is a written knowledge test, not a skills test, so you won't perform any driving maneuvers. The test covers information on handling, inspecting, and coupling/uncoupling double and triple trailers. It's important to have a good understanding of these areas to pass the written test. Practical skills are typically developed during on-the-job training after receiving the endorsement.
No, it's not permissible to operate double or triple trailers without a valid CDL Doubles/Triples endorsement in Iowa. This endorsement is required by federal and state law for any driver who intends to operate a vehicle towing two or three trailers. Driving without the proper endorsement can result in penalties, including fines and suspension of your commercial driving privileges.
You can add the CDL Doubles/Triples endorsement to your existing Commercial Driver's License. You don't need to initiate a new application for a CDL. However, you will need to pass the Doubles/Triples written knowledge test and pay any required fees to add the endorsement to your current CDL.
Yes, there are limitations for drivers with a CDL Doubles/Triples endorsement. One major constraint is the Gross Combination Weight Rating (GCWR) of 26,001 pounds or more, provided the GVWR of the vehicle(s) being towed is more than 10,000 pounds. Additionally, drivers must adhere to specific safety regulations related to coupling and uncoupling, inspecting, and driving double/triple trailers.
In Iowa, the maximum length for a double trailer is 81.5 feet. For triple trailers, it's 100 feet. The maximum weight for any vehicle or combination is 80,000 pounds gross weight depending on axle and bridge formula. However, specific weight limits can also be determined by the Federal Bridge Gross Weight Formula. Always check local and state laws for specific restrictions.
Yes, there are specific safety regulations for driving double/triple trailers. Drivers must adhere to guidelines concerning coupling and uncoupling, inspecting the trailers, and maintaining safe following distances. Other regulations include not driving in the left-most lane on interstates, obeying speed limits, and securing cargo properly. These regulations aim to ensure the safety of the driver and other road users.
