2026年CDL模拟考试
模拟考试精准告诉你何时准备好通过考试。
练习2,000+道CDL考试题目,涵盖一般知识、气刹车、危险品及所有附加考试——基于各州官方CDL手册编制,每道题都有详细解析。免费开始,无需注册。
2,000+
CDL题目
50
覆盖州数
7
背书类型
100%
附带解释
用真题练习
2,000+道来自官方CDL手册的题目。每个答案都包含详细解释和手册参考。
专注于你的错题
你答错的题目会自动重复出现。系统跟踪你在每个背书中的薄弱点,并制定个性化学习计划。
知道何时准备就绪
你的IQ准备度评分™跟踪6个准备维度。当你达到80%+时,就可以预约考试了。
CDL等级:A、B和C
CDL驾照根据车辆重量和类型分为三个等级。你的等级决定了你可以驾驶哪些车辆以及需要哪些背书考试。
A级
组合车辆,GCWR为26,001磅以上,被拖车辆超过10,000磅。包括半挂车、平板车、牲畜运输车和油罐车。
B级
GVWR为26,001磅以上的重型单车辆,或拖行10,000磅以下的车辆。包括直卡车、大型公共汽车、自卸车和箱式卡车。
C级
26,001磅以下、设计用于运输16人以上乘客或运载需要标牌的危险材料的车辆。
CDL背书
HazMat(H)
The HazMat endorsement (H) authorizes you to transport hazardous materials in commercial vehicles. This is one of the most sought-after CDL endorsements because it opens doors to higher-paying freight routes, including fuel tankers and chemical transports. Federal law requires a TSA background check in addition to the written knowledge test.
立即练习大多数人需要Air Brakes
The air brakes endorsement removes the air brake restriction from your CDL, allowing you to operate any commercial vehicle equipped with air brakes. Nearly all heavy trucks and buses use air brake systems, so passing this test is essential for most CDL holders. Without it, your CDL will carry a restriction limiting you to vehicles without air brakes.
立即练习Tanker(N)
The Tanker endorsement (N) is required to drive a commercial vehicle designed to transport liquid or gaseous materials in a tank or tanks rated at 119 gallons or more. Liquid cargo behaves differently from solid freight -it surges and shifts, changing the vehicle's center of gravity. This endorsement ensures drivers understand these unique handling challenges.
立即练习School Bus(S)
The School Bus endorsement (S) authorizes you to drive a school bus carrying students. This is one of the most regulated CDL endorsements due to the safety of child passengers. In addition to the knowledge test, most states require a thorough background check, and many require a separate skills test in a school bus. School bus drivers must also hold a Passenger (P) endorsement.
立即练习Passenger(P)
The Passenger endorsement (P) authorizes you to drive a commercial vehicle designed to carry 16 or more passengers, including the driver. This endorsement is required for bus drivers, shuttle operators, and anyone operating large passenger vehicles. It covers the unique safety considerations of transporting people rather than cargo.
立即练习Doubles/Triples(T)
The Doubles/Triples endorsement (T) authorizes you to pull double or triple trailers with a Class A CDL. This endorsement is common in long-haul freight operations where companies use multiple trailers for efficiency. Driving doubles and triples requires additional skill because the longer combination amplifies handling challenges like rearward amplification and off-tracking.
立即练习Combination
Combination vehicles knowledge is tested as part of the Class A CDL general knowledge exam. It covers the operation of tractor-trailer rigs and other combination vehicles where a power unit pulls one or more trailers. Understanding coupling, uncoupling, jackknifing, and the unique handling characteristics of articulated vehicles is essential for any Class A CDL driver.
立即练习按州练习CDL
CDL知识考试由你所在州的DMV或执照机构管理。虽然CDL手册全国标准化,但每个州设定自己的费用和要求。
CDL学习指南

CDL · 7 min read
CDL Practice Test: What to Expect and How to Prepare
The CDL knowledge test is longer and harder than the regular DMV test. Here's how to prepare efficiently.
Read more
CDL · 6 min read
CDL Endorsements Explained: H, N, P, S, T, X
Each endorsement opens different job opportunities. Learn what H, N, P, S, T, and X mean and which ones you need.
Read more