North Dakota CDL DMV Endorsement Passenger 1

A wig wag is a type of low air pressure warning device in an air brake system. It drops a mechanical arm into the driver's view when the air pressure in the tanks falls below 60 psi.

Both systems in a dual air brake system share a single air compressor. If the air compressor is damaged, neither system will be able to operate properly.

If brakes are used too much, they will overheat and become less effective. This is referred to as brake fade.

Spring brakes come on automatically when air pressure drops to an unsafe psi level. Instead of waiting for the spring brakes to automatically activate, you should safely exit the road as soon as you notice the low pressure warning signal and bring your vehicle to a stop while you are still able to control the brakes.

You should not refuel a bus while passengers are on board, unless it is absolutely necessary to do so. In particular, never refuel a bus carrying passengers while inside an enclosed building.

While driving, you should continually scan the road to spot potential hazards in advance. Make emergency plans for how to deal with the hazards if they become dangerous.

A tire load rating is the maximum safe weight that can be carried by a tire at a specified pressure. This number is stated on the side of each tire.

The liver removes alcohol from the body at a fixed rate that cannot be accelerated through common tricks, such as drinking coffee or taking a cold shower. The only way to sober up after drinking is to give your body the time it requires to process the alcohol out of your system.

If an ABS system fails, the vehicle will still have normal braking function. The driver should continue to drive and brake as they normally would.

While driving, you should continually scan the road to spot potential hazards in advance. Make emergency plans for how to deal with the hazards if they become dangerous.

At dawn or dusk, and in snowy or rainy conditions, you should turn on your headlights to make it easier for other road users to see your vehicle.

Tires need to have at least 4/32 of an inch of tread depth in every major groove on the front tires, and at least 2/32 of an inch of tread depth on other tires.

When pressing the brake pedal in a vehicle with S-cam brakes, air will enter the brake chambers. The added air pressure will push out the rods and move slack adjusters, twisting the brake camshafts.

In an air brake system, the air storage tanks hold enough air for brakes to be used several times if the compressor stops working.

A bus must always be inspected before it is driven. The inspection process must include a review of the inspection report made by the previous driver. You should operate the vehicle only if defects listed on the inspection report have been certified as repaired or as not needing to be repaired.

If you begin to feel sleepy while driving, the only safe response is to stop driving and get some sleep. Attempting to fight off exhaustion is dangerous and a major cause of fatal crashes. Stimulants are not a safe solution because they may help keep you awake but will not make you more alert. Once stimulants wear off, you will be even more tired than you were originally.

The average driver has a reaction time of between three-quarters of a second and one second.

When performing a static leakage test on a double combination vehicle with air brakes, the leakage rate should be no more than 3 psi in one minute. If air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.

On a bus, all baggage and freight should be stored in a manner that allows the driver to move freely and easily; allows riders to exit by any window or door in an emergency; and protects riders from injury if items fall or shift.

A convex mirror makes objects seem smaller and farther away than they actually are.