This commercial driver study guide covers relevant Federal Motor Carrier Safety Administration (FMCSA) Entry-Level Driver Training (ELDT) concepts and California commercial driver knowledge topics. Review the regulations, procedures, and safety checklists below as part of your CDL and commercial learner permit (CLP) preparation.
Know dimensions and weight
Know actual loaded height, width, length, overhang, gross and axle weights. Signs and permits control access, but pavement changes, snow, suspension movement, and uneven approaches can reduce effective clearance.
Overhead clearance
Slow and verify uncertain bridges, wires, branches, canopies, tunnels, and work-zone equipment before entry. Never assume another truck’s clearance proves yours.
Bridge and weight limits
Read weight and lane restrictions early. Do not cross when the vehicle exceeds a posted or permit limit. Stop safely and obtain an authorized route rather than turning on an unsuitable road.
Roadside stop
Signal, check mirrors, slow gradually, choose a firm visible area, keep as far from traffic as practical, secure the vehicle, and activate/place warnings as required. Avoid soft shoulders, curves, hills, and fire hazards.
Reenter traffic
Inspect around the vehicle, remove warning devices safely, build speed when space permits, signal, check mirrors and blind areas, and merge without forcing traffic. Cancel the signal and restore space.
Curb and roadside hazards
Protect tires and wheels from curbs, keep overhang away from signs and pedestrians, and account for trailer tail swing. Do not climb a curb merely to complete a test turn.
Scenario
A bridge sign shows less clearance than the loaded vehicle. The applicant stops before committing and requests a new route rather than relying on visual guesswork.
Commercial Driver License Exam Readiness: Achieving a passing grade of 80% or higher on state DMV commercial driver knowledge exams requires mastery of federal vehicle inspection procedures, gross vehicle weight ratings (GVWR / GCWR), braking mechanics, and road safety regulations.