CDL Doubles/Triples Endorsement Practice Exam - Prep & Study Guide

The correct adjustment to make when going through a curve with a combination vehicle is to slow down to prevent tipping. When navigating curves, especially with doubles or triples, the risk of tipping is heightened due to the shifting weight distribution in the trailers. A combination vehicle, which consists of several trailers, has a higher center of gravity compared to a standard truck.

Slowing down allows the driver to better control the vehicle’s movements and maintain stability. This is crucial because if a driver enters a curve too quickly, the momentum can cause the vehicle to tip over or lose control, particularly in a configuration with multiple trailers where the extra weight and length can affect handling. By reducing speed, the driver can safely navigate the curve, ensuring the trailers follow the same path without swaying or veering off course.

Maintaining speed or speeding up poses significant hazards. High speed in a curve could lead to loss of traction and control, while simply adjusting the steering angle without reducing speed does not address the underlying risk of instability.