CDL Hazmat Endorsement — All Questions

Why should you never smoke while loading or unloading hazardous materials?

• a.A spark or flame could ignite flammable materials or vapors✓
• b.It violates the driver's logbook rules
• c.Smoking stains the packages
• d.It slows down the loading process

Smoking near hazardous materials, especially flammable liquids, gases, explosives, and oxidizers, can ignite vapors and cause a fire or explosion. Keep all ignition sources at least 25 feet away when handling these materials. No smoking signs should be posted at loading areas.

What must you do with the engine before loading or unloading most hazardous materials?

• a.Turn off the engine unless it is needed to operate a pump✓
• b.Disconnect the battery
• c.Rev it to keep it warm
• d.Leave it idling at all times

You should turn off the engine before loading or unloading hazardous materials unless the engine is needed to run a pump for a cargo tank. A running engine is an ignition source and safety risk. Set the parking brake and chock the wheels while working.

When loading hazardous materials, how should containers be secured?

• a.Braced so they cannot fall, slide, or be damaged during transport✓
• b.Placed only on the truck roof
• c.Left unsecured for quick unloading
• d.Stacked loosely so they can shift

All hazardous materials packages must be secured against movement so they cannot fall, slide, or be crushed during transport. Use bracing, blocking, and load bars as needed. Damaged packaging can release the material and create a serious hazard.

What tool must never be used near packages of Class 1 explosives?

• a.A cargo net
• b.A pallet jack
• c.A load strap
• d.Any tool that could damage the package or create a spark, such as a hook✓

You must not use hooks or other tools that might damage explosive packaging or create sparks. Explosives (Class 1) require extra care in handling. Use flat surfaces and avoid dropping, dragging, or rolling the containers.

What does the term 'do not load together' refer to in hazmat transport?

• a.A limit on the total truck weight
• b.The segregation and separation rules that keep incompatible materials apart✓
• c.A rule about parking distance
• d.A ban on night driving

Certain hazardous materials react dangerously if they mix, so the regulations include a segregation table showing which materials must not be loaded or stored together. For example, oxidizers must be kept apart from flammable liquids. Following segregation rules prevents dangerous reactions.

How far from the cargo must certain materials like cyanides be kept from acids?

• a.Distance does not matter
• b.Only one foot apart
• c.They must be separated so they cannot mix even if there is a leak✓
• d.They may be loaded together

Cyanides and cyanide mixtures must never be loaded with acids because contact can produce deadly gas. The segregation rules require they be kept apart so a leak from one cannot reach the other. This is a critical safety separation.

What must you check before loading a package of hazardous material?

• a.The driver's meal schedule
• b.That the package is not leaking or damaged✓
• c.The color of the truck
• d.The manufacturer's stock price

Before loading, inspect each package to make sure it is intact and not leaking. Never transport a leaking hazmat package. A damaged or leaking container must be refused or handled according to emergency procedures.

When must a driver keep an eye on (attend) a placarded vehicle carrying explosives?

• a.Only during rainstorms
• b.Never
• c.At all times, either by the driver or a qualified person, except when parked in a safe haven✓
• d.Only when the fuel tank is full

A vehicle carrying Division 1.1, 1.2, or 1.3 explosives must be attended at all times except when parked in a safe haven. The person attending must be awake, within 100 feet, and able to move the vehicle. This reduces the risk of theft or tampering with explosives.

What is a 'safe haven' for parking a hazmat vehicle?

• a.A rest stop with a restaurant
• b.Any residential street
• c.A shopping mall parking lot
• d.An approved place for parking loaded explosive vehicles✓

A safe haven is a government-approved location for parking vehicles loaded with certain explosives. It reduces the danger to the public and property. Drivers should know where safe havens are located along their routes.

What should you do with cargo heaters when transporting certain flammable hazardous materials?

• a.Add extra fuel to the heater
• b.Remove the truck's exhaust system
• c.Turn them to maximum heat
• d.Follow the rules that may require the heater to be shut off during transport✓

There are special rules for cargo heaters when hauling flammable liquids, flammable gases, and explosives, and in many cases the heater must be turned off. A heater is an ignition source that could ignite flammable cargo or vapors. Always check the rules for the specific material you carry.

Where should you avoid parking a vehicle loaded with hazardous materials?

• a.Only on interstate highways
• b.Within 5 feet of the traveled part of a road, or near open fires, bridges, and tunnels when avoidable✓
• c.Only in rural areas
• d.Anywhere with a paved surface

You must not park a placarded vehicle within 5 feet of the traveled portion of a road except for brief operational needs. You should also avoid parking near open fire, bridges, tunnels, and buildings where a leak could endanger many people. Choose the safest possible location when a stop is unavoidable.

How should you handle packages marked with orientation arrows (this end up)?

• a.Lay them flat on their sides
• b.Stack them any way that saves space
• c.Turn them upside down
• d.Load and keep them in the direction the arrows point (upright)✓

Packages with orientation arrows contain liquids or materials that must stay upright to prevent leaks or venting problems. Load them so the arrows point up and keep them that way during transport. Ignoring the arrows can cause a spill.

When loading a cargo tank with flammable liquids, why is bonding and grounding important?

• a.To speed up the pumping
• b.To keep the liquid warm
• c.To prevent static electricity from causing a spark and igniting vapors✓
• d.To reduce the weight of the load

Flowing liquid can build up a static electric charge that could spark and ignite flammable vapors. Bonding and grounding connect the tank and the loading equipment so the charge drains away safely. This is essential when loading or unloading flammable liquids.

What must you do before loading or unloading a cargo tank of flammable liquid?

• a.Leave the vehicle unattended
• b.Disconnect the trailer
• c.Fill the tank completely first
• d.Set the parking brake, chock the wheels, and stay within 25 feet of the tank✓

Before transferring flammable liquid, set the brakes and chock the wheels so the vehicle cannot move. The person doing the loading or unloading must control the process and stay within 25 feet, never leaving it unattended. Constant attendance allows a quick response to any problem.

How should packages of Class 7 radioactive materials be considered when loading?

• a.Delivery time only
• b.Their transport index, which limits how they are grouped and separated from people✓
• c.Weight only
• d.Color only

Radioactive packages have a transport index indicating their radiation level, and the total index in a vehicle is limited. They must be kept separated from people and from undeveloped film. Following these separation rules limits radiation exposure.

What should you do if you discover a leaking hazardous materials package during loading?

• a.Load it quickly before it leaks more
• b.Pour water on it and continue loading
• c.Do not load or transport it; keep it away from people and follow emergency procedures✓
• d.Cover it with a blanket and drive fast

A leaking package must never be loaded or transported. Keep people away, avoid contact with the material, and follow the shipper's and emergency response information. Contact the shipper and appropriate authorities as required.

Why must flammable liquids and oxidizers be kept apart during loading?

• a.They belong to the same hazard class
• b.They have the same placard
• c.They are heavy together
• d.Oxidizers can greatly intensify a fire if flammable liquids ignite✓

Oxidizers supply oxygen that can make a fire burn much hotter and faster. If they mix with flammable liquids and ignite, the result can be a violent fire. The segregation table requires keeping these materials separated.

What is the rule for transporting hazardous materials in the same vehicle as food or feed?

• a.It is always allowed with no conditions
• b.Poisons and certain materials must not be loaded with food or animal feed✓
• c.Only frozen food is affected
• d.Food must be loaded on top

Materials labeled as poison or poison inhalation hazard must not be loaded in the same vehicle with food, feed, or edible items meant for humans or animals. Contamination could poison the food supply. This is a strict segregation rule.

What must be done to a placarded vehicle's cargo before a driver takes it on the road?

• a.Make sure the load is properly blocked, braced, and secured so it will not shift✓
• b.Only wash the exterior
• c.Nothing, the shipper handles everything
• d.Only weigh the truck

The driver is responsible for ensuring hazardous cargo is secured so it cannot move, fall, or become damaged in transit. Shifting loads can rupture containers and cause spills. Recheck the load securement during the trip.

Why should hazmat drivers avoid using an ignition source near the cargo area during a stop?

• a.It drains the battery
• b.It is only a paperwork issue
• c.Flammable vapors could ignite and cause a fire or explosion✓
• d.It scares other drivers

Flammable vapors can accumulate around leaking or venting hazmat containers, and any spark or flame could ignite them. Keep matches, lighters, and other ignition sources away from the cargo. This is a basic fire-prevention practice.

When loading containers of corrosives, what should you avoid?

• a.Securing them with straps
• b.Stacking them where a leak could drip onto and damage other packages or the driver✓
• c.Checking them for damage
• d.Placing them upright

Corrosives can eat through packaging and other materials, so avoid stacking them where a leak could drip onto other cargo or come into contact with the driver. Load them so any leak stays contained. Inspect corrosive containers carefully before loading.

What is required when a driver must be present during the loading and unloading of certain hazmat cargo tanks?

• a.No attendance is ever required
• b.The driver may sleep in the cab
• c.The driver or qualified person must attend and control the process the entire time✓
• d.The driver can leave once the pump starts

For flammable and certain other hazardous cargo tank transfers, a qualified person must attend the operation from start to finish. Attending means being alert, within 25 feet, with a clear view, and able to stop the flow quickly. Constant attendance prevents overfills and spills.