CDL glossary

Most tested words

hazardous materials HazMat

危险品

Substances that endanger health, safety or property when transported.

tires

轮胎

The rubber casings on the wheels that grip the road.

commercial driver's license CDL

CDL（商业驾驶执照）

A commercial driver's license (CDL) is required to drive a commercial motor vehicle (CMV).

tractor

牵引车（tractor）

The power unit built to pull a semitrailer on its fifth wheel.

placard

危险品标识

A diamond-shaped sign on a vehicle showing its cargo's hazard class.

skid

打滑

The tires lose their grip and the vehicle slides.

commercial motor vehicle CMV

商用机动车（CMV）

A commercial motor vehicle (CMV) is a heavy truck, big bus, or placarded vehicle.

warning devices

警示装置（warning devices）

Reflective triangles or flares that warn traffic your vehicle is stopped.

brake pedal

制动踏板（brake pedal）

The foot control that sends air to the brakes.

mirrors

侧视镜

Side-mounted glass showing the driver traffic beside and behind the vehicle.

parking brake

驻车制动器

The brake that holds the vehicle still when parked.

traction

抓地力

The grip between the tires and the road surface.

Topics

• Air brakes气刹系统

  Air brakes stop a heavy vehicle with compressed air instead of brake fluid.

  brake pedal, parking brake, air brakes

• Combination vehicles, doubles and triples组合车辆、双挂车与三挂车

  A combination is a tractor or truck pulling one or more trailers.

  tractor, jackknife, triples

• Hazardous materials危险品

  Hazardous materials are cargo that can harm people or property if it spills, burns or leaks.

  hazardous materials, placard, shipping paper

• Tank vehicles罐车

  A tank vehicle carries liquid or gas in bulk.

  tank vehicle, center of gravity, liquid surge

• Passenger and school bus载客车辆与校车

  These words come from the Passenger and School Bus tests: loading and unloading, emergency exits, railroad crossings and the danger zone around a bus.

  railroad crossing, school bus, emergency exit

• Pre-trip inspection parts出车前检查部件

  These are the parts you name and check during the pre-trip inspection test.

  tires, warning devices, mirrors

• Driving and safety驾驶与安全

  Words from the General Knowledge test about controlling the vehicle: stopping distance, skids, following distance, securing cargo, and the limits on speed, alcohol and fatigue.

  skid, traction, stopping distance

• License, rules and roadsideCDL、规定与路边检查

  Who needs a CDL, which class, which endorsements and restrictions, and the rules that follow you on the road: hours of service, medical cards, inspections and disqualification.

  commercial driver's license, commercial motor vehicle, pre-trip inspection

• Numbers and units on the test考试中的数字与单位

  The test uses US units: feet, miles per hour, psi, pounds and gallons.

  feet, miles per hour, miles

• Work and freight words工作与货运用语

  Words you hear from dispatchers, brokers and shippers in your first weeks.

  shipper, flatbed, dispatcher