CDL General Knowledge — Complete Study Guide

Pre-trip, on-the-road, and post-trip inspection procedures. Topics include: tire tread depth (4/32 inch steer, 2/32 inch others), brake system inspection, engine compartment checks, and DVIR requirements.

Shifting, backing, turning, and speed management. Topics include: double-clutching, progressive shifting, off-tracking in turns, GOAL (Get Out and Look) backing technique.

Speed management, space management, night driving, and adverse weather conditions. Topics include: following distance (6+ seconds under 40mph), hydroplaning, black ice, brake fade prevention, and emergency maneuvers.

Air brake system components, operation, and testing. Topics include: dual air systems, governor cut-out (100-125 psi), low air warning (below 60 psi), spring brake operation, static leakage tests, and ABS operation.

Coupling and uncoupling tractor-trailers. Topics include: fifth wheel inspection, kingpin locking, tug test, glad hand connections (red=emergency, blue=service), and jackknife prevention.

Cargo securement rules and weight distribution. Topics include: tie-down requirements (WLL ≥ 50% of cargo weight), Bridge Formula, weight ratings (GVWR, GCWR), and special cargo handling.