Do not assume that posted height clearances are accurate. If the road was repaved after the sign was posted, or if there is packed snow on the ground, the actual height of the opening may be different than what is indicated. If you are not confident that your vehicle will be able to safely clear an upcoming bridge or overpass, you should slow down and find another path, if possible.

Backing a commercial motor vehicle is always dangerous because you cannot see everything behind you. When backing, make frequent checks of the mirrors on both sides of the vehicle. Use a helper whenever possible.

Bus accidents most commonly occur at intersections. Use caution, even if the intersection is controlled by signs or signals.

Texting while driving is particularly dangerous because it is both a mental and physical distraction to the driver. In addition to diverting a driver's mental attention away from the road, texting requires a person to remove at least one hand from the vehicle's controls.

The aisles and stairwells of a bus should always be kept clear. Luggage and freight must be placed in a location that allows passengers to exit through any window or door in the event of an emergency.

During the on-road driving test, the examiner will be scoring you on specific driving maneuvers, as well as your general driving behavior.

The adjustment of your mirrors should be checked prior to the start of all trips. Adjust your mirrors as needed.

While some hazardous materials may be transported by bus under specific conditions, labeled radioactive materials must never be carried in the space occupied by people.

Rust around wheel nuts can indicate that the nuts are loose. If you find rust near the wheel nuts, check their tightness before beginning to drive.

Tires should never have too much air pressure. Be sure to check your tires' air pressure with a gauge during inspections.

Posted speed limits on exit and entrance ramps often show speeds that are safe to be driven by cars. However, these speed limits may be too fast for large or heavily-loaded vehicles and CMV drivers will likely need to slow down to a speed below the posted limit.

While regular mirror checks should be part of your normal scanning routine, be especially sure to check your mirrors when changing lanes.

Explosives are placed in hazardous materials Class 1.

You should always complete an after-trip inspection of your vehicle at the end of a trip, day, or tour of duty. Complete a vehicle inspection report, if required.

Always signal well ahead of a turn or lane change. Signal continuously until you have completed the turn or lane change, then be sure to cancel the signal so you do not confuse other drivers.

The faster you drink, the higher your blood alcohol content (BAC) will become. The liver removes alcohol from a body at a fixed rate of about one drink per hour.

If a tractor-trailer is so equipped, the trailer brake hand valve can be used to stop the vehicle from rolling back when being started from a stop.

A driver is allowed to exit their vehicle to check its position during any basic vehicle control skills test exercise. This action is called a "look." During the straight line backing exercise, a driver may not exceed one look. During any other exercise, a driver may not exceed two looks.

You should accelerate very gradually when driving under conditions that create poor traction.

When doing a pre-trip inspection on a vehicle with power steering, be sure to check the hoses, pumps, and fluid level. In particular, you should check the hoses for leaks.