Commercial Driver's License Medical Card and Self-Certification

Alcohol first affects judgment and self-control. For commercial drivers, it is illegal to operate a CMV with a BAC of 0.04% or higher, not 0.08%.

Study focusUnderstand state-specific CDL requirements, handbook notes, and licensing context.

Common trapUsing generic CDL knowledge without checking state-specific requirements.

At night, your visibility is limited to the reach of your headlights. You must adjust your speed so you can safely stop within that visible distance.

Study focusUse inspection habits to catch unsafe defects before driving.

Common trapChecking only obvious items and missing brake, tire, coupling, or defect-report steps.

While avoiding fines is good, safety is the primary reason for inspections. A defect found during an inspection can prevent a breakdown or fatal crash.

Study focusUse inspection habits to catch unsafe defects before driving.

Common trapChecking only obvious items and missing brake, tire, coupling, or defect-report steps.

Following too closely (tailgating) severely reduces your reaction time and stopping distance, making it a leading cause of crashes.

Study focusUnderstand state-specific CDL requirements, handbook notes, and licensing context.

Common trapUsing generic CDL knowledge without checking state-specific requirements.

Correct shifting ensures you have engine braking when needed and prevents stalling or getting stuck in neutral, which compromises your control of the vehicle.

Study focusUse inspection habits to catch unsafe defects before driving.

Common trapChecking only obvious items and missing brake, tire, coupling, or defect-report steps.

If headlights fail, immediately turn on hazard lights or turn signals to make yourself visible, slow down, and steer to a safe stop off the roadway.

Study focusUse inspection habits to catch unsafe defects before driving.

Common trapChecking only obvious items and missing brake, tire, coupling, or defect-report steps.

Mirrors are a key visibility tool for a commercial driver. They support lane changes, turns, backing, and awareness around the vehicle.

Source focusCDL Manual - Vehicle Inspection and Seeing

Study focusConnect mirror condition and adjustment to safe driving.

Common trapTreating mirrors as comfort equipment instead of safety equipment.

Loose steering can point to a safety defect. Steering problems should be addressed before the vehicle is operated.

Source focusCDL Manual - Vehicle Inspection

Study focusIdentify steering concerns as pre-trip safety defects.

Common trapTreating steering defects as minor comfort issues.

Lug nuts secure the wheel. Loose or missing lug nuts can lead to wheel failure or separation.

Source focusCDL Manual - Vehicle Inspection

Study focusRecognize wheel fastener defects during inspection.

Common trapChecking tire tread but ignoring wheel attachment.

Brake defects can make the vehicle unsafe to operate. Safety-related defects should be corrected before driving.

Source focusCDL Manual - Vehicle Inspection

Study focusIdentify stop-and-correct pre-trip defects.

Common trapTreating safety defects as items to fix after the trip.

In California, the maximum speed limit for a commercial motor vehicle with 3 or more axles, or any vehicle pulling a trailer, is generally 55 mph.

Study focusUnderstand state-specific CDL requirements, handbook notes, and licensing context.

Common trapUsing generic CDL knowledge without checking state-specific requirements.

California Vehicle Code requires all loads to be fully secured or covered to prevent any spillage on the roadway.

Study focusUnderstand state-specific CDL requirements, handbook notes, and licensing context.

Common trapUsing generic CDL knowledge without checking state-specific requirements.