There are several reasons why driving at night is more difficult than driving during the day. It is more difficult for drivers to see hazards, the glare of headlights can affect drivers' vision, and there are more fatigued drivers on the road.

Unless you must run the engine to operate a pump, you should always turn off the engine before loading or unloading flammable liquids.

The first hazardous materials class includes explosives such as ammunition, dynamite, and fireworks.

Always watch for hazards on the road ahead. Doing this will allow you time to react to hazards before meeting them.

A vehicle that lacks the proper placards for any hazardous materials on board may not be driven, except as necessary to protect life and property in an emergency.

Potential warning signs of fatigue include difficulty focusing, frequent blinking, or heavy eyelids; yawning repeatedly or rubbing your eyes; daydreaming; wandering or disconnected thoughts; trouble remembering the last few miles you've driven; missing exits or traffic signs; having trouble keeping your head up; drifting from your lane; following too closely; hitting a shoulder rumble strip; or feeling restless and irritable.

If you are not sure which method to use when putting out a fire, do not attempt to extinguish the fire on your own. Instead, wait for firefighters to arrive and let them handle it. This is especially true if you are experiencing a hazardous materials fire.

In vehicles equipped with an automatic tractor protection valve, the valve will pop out if air pressure drops to a level between 20 and 45 psi. When the valve pops out, the protection valve will close, stopping the flow of air.

Distracted drivers perceive hazards on the road more slowly than drivers who are focused, or they do not perceive hazards at all.

Because liquids expand as they increase in temperature, drivers must allow some extra space in the tank, known as outage, to accommodate the expansion. Different liquids expand at different rates. Drivers must always be aware of the outage requirements for the specific cargo they are carrying.

Smooth bore tanks, also known as unbaffled tanks, contain nothing to slow the movement of liquid and are likely to be affected by front-to-back liquid surge.

Before a trip, you should ensure that air reaches all air brakes on all trailers by opening up the rear emergency line and service line shut-off valves and listening for escaping air. Close both shut-off valves before beginning to drive.

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.

You should always slow down to a safe speed and shift into a lower gear before entering a curve.

Tank vehicles have a high centers of gravity and are therefore particularly vulnerable to rollover. To lower this risk, tank vehicles should be driven well below the posted speed limit on curves.

The force of gravity will cause a vehicle's speed to increase when traveling downhill.

The average driver has a reaction time between three-quarters of a second and one second. At 55 mph, this corresponds to a distance of 61 feet traveled.

Aggressive driving is defined as operating a motor vehicle in a selfish, bold, or pushy manner. Road rage is defined as operating a motor vehicle with the intent of doing harm to others, or the intent of physically assaulting another driver or their vehicle.

Before slowing down, it can be a good idea to lightly tap your brakes. This will cause your brake lights to flash, providing a warning to motorists behind you.

If your hydraulic braking system will not build up the pressure needed to slow or stop your vehicle, there are a few possible solutions. Try shifting into a lower gear, pumping the brakes, and/or using the emergency brake.