2026年CDL模拟考试
CDL模拟考试，告诉你何时准备好通过考试
练习涵盖一般知识、气刹车、危险品及所有附加考试的CDL考试题目，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。
Prefer to study on your phone? Get the free CDL Prep app
2,800+
CDL题目
50
覆盖州数
All
所有科目与背书
100%
附带解释
用真题练习
~5,000 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。
精准知道何时准备就绪
IQ准备度评分衡量CDL考试准备的六个维度：记忆稳定性、考试表现、内容覆盖率、近期准确度、难度掌握和反应速度。
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
Each section is a separate written test. Start with the core knowledge tests, then add the endorsements your job needs. Every set is free.
Core knowledge tests
General Knowledge
Required first50 questions · 90 min · 80% to pass
Every CDL starts here. Vehicle control, safe driving, and cargo basics that every commercial driver must pass, regardless of class.
Air Brakes
25 questions · 30 min · 80% to pass
Removes the air brake restriction from your CDL. Covers system components, inspection steps, and braking with air-equipped vehicles.
Combination
Class A only20 questions · 25 min · 80% to pass
Required for Class A. Coupling and uncoupling, trailer handling, and preventing rollovers and jackknifes in tractor-trailer rigs.
Pre-Trip Inspection
Skills test · Part 1
The first part of the skills test and the most failed. Learn the full inspection sequence before you start the engine on test day.
Endorsements
HazMat(H)
Most popular30 questions · 40 min · 80% to pass
Transport hazardous materials. Placarding, loading rules, and emergency response. Requires a TSA background check in every state.
Tanker(N)
20 questions · 25 min · 80% to pass
Drive tank vehicles carrying liquids or gases. Surge control, baffled vs. unbaffled tanks, and the handling risks of liquid loads.
Passenger(P)
20 questions · 25 min · 80% to pass
Carry 16 or more passengers. Loading, emergency exits, railroad crossings, and the rules that apply to buses of every kind.
School Bus(S)
20 questions · 25 min · 80% to pass
The most regulated endorsement. Student loading zones, danger zones around the bus, and emergency procedures. Requires P first.
Doubles/Triples(T)
20 questions · 25 min · 80% to pass
Pull double or triple trailers with a Class A. Coupling sequence, crack-the-whip effect, and multi-trailer stability.
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。
Interactive CDL guides
Free trainers and data tools for the parts of the CDL that trip drivers up the most.
Pre-Trip Inspection Trainer
Interactive walk-around and a say-it-out-loud drill for every FMCSA spec you must memorize.
Air Brake Check Simulator
Step through the full air-brake check with a live PSI gauge, plus the CVSA data on why brakes matter most.
HazMat Endorsement Guide
The TSA background check, the cost, and an explorer of all nine hazard classes.
Where Triple Trailers Are Legal
An interactive map of where triple trailers are actually legal, and the 1991 freeze behind it.
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