What does the CDL Combination Vehicles test cover?

The CDL Combination Vehicles test covers: coupling and uncoupling procedures, brake system operation, trailer swing prevention, rollover avoidance, pre-trip inspection requirements, and more — all based on FMCSA CDL Manual Chapter 6.

What score do I need to pass the CDL Combination Vehicles test?

Requirements vary by state, but most states require at least 80% to pass the CDL written test. We recommend scoring 90% or higher on practice tests before taking the real exam.

CDL Combination Vehicles Practice Test 2 (20 Questions with Explanations)

CDL Combination Vehicles · Practice Test 2

20 Questions · Detailed Explanations

This CDL Combination Vehicles practice test covers high-frequency exam topics including coupling and uncoupling procedures, trailer swing prevention, brake systems and load distribution, and more — all based on FMCSA CDL Manual Chapter 6.

Click any question number to view the full explanation. We recommend working through all questions in order and aiming for 90% or higher before scheduling your CDL permit test.

Coupling & Uncoupling Trailer Swing Brake Systems Pre-Trip Inspection Load Distribution Rollover Prevention

About the CDL Combination Vehicles Test

The CDL Combination Vehicles endorsement is required to operate semi-trucks, double trailers, and other combination vehicles. The written test is based on FMCSA's Commercial Driver's License Standards (49 CFR Part 383), Chapter 6, and focuses on six core topic areas:

Coupling & Uncoupling: Step-by-step procedures for properly connecting and disconnecting the fifth wheel and trailer
Trailer Swing: Causes of trailer jackknife and swing during sharp turns or hard braking, and how to prevent them
Brake Systems: Air brake coordination, brake lag, and how the Anti-Lock Braking System (ABS) works on combination vehicles
Load Distribution: How cargo weight and center of gravity affect stability, plus axle weight compliance
Rollover Prevention: Identifying risks from speeding through curves and cargo shift that can cause a rollover
Pre-Trip Inspection: Safety inspection items specific to combination vehicles

This 20-question practice test is weighted to reflect the real exam's topic distribution. Every question includes a detailed explanation and the corresponding CDL manual section, making it ideal for first-time applicants and those studying for a retake.