Driving Safely
Driving Safely is the broadest domain in the Nevada CDL General Knowledge exam. It tests whether you can operate a commercial vehicle without creating avoidable risk: using restraints, recognizing fatigue and impairment, controlling distractions, choosing a safe speed, and scanning for trouble early. The exam favors practical judgment over memorized slogans.
Core rules
- Wear the seat belt every trip. It keeps you behind the wheel and inside the cab in a crash.
- Fatigue is impairment. Get rest before driving; stop and rest when sleepy. Coffee, cold air, and loud music do not restore alertness.
- Alcohol and drugs: federal CDL rules use a 0.04% BAC threshold, lower than the 0.08% noncommercial limit. Impairment can begin before any legal limit.
- Distractions: texting, eating, adjusting devices, and looking at maps take your eyes and mind off the road. Pre-set route and controls before moving.
- Speed must fit conditions-traffic, weather, road, load, and visibility-not just the posted number.
- Scan ahead and around; identify hazards early; leave yourself a way out.
Worked example
A driver at 55 mph looks down at a phone for 3 seconds. At 55 mph the vehicle travels about 81 feet per second, so it covers roughly 242 feet-over two-thirds of a football field-before the driver looks up. If traffic stopped 200 feet ahead, the driver would hit it even with perfect brakes, because perception and reaction have not yet begun. The safe choice is to keep the phone out of reach and pre-set navigation.
Traps
- Treating the posted speed limit as safe in rain, fog, or heavy traffic.
- Believing a legal BAC means fit to drive; CDL standards are stricter.
- Thinking a rolled-down window or caffeine cures fatigue.
- Using a handheld phone because traffic is light.