What are hazardous-material containment rules designed to do?
Correct answer: Keep hazardous material safely inside its packaging
Containment rules protect people and the environment by controlling packaging and handling.
Source: Texas DL-7C, March 2026, section 9, PDF page 113: Regulation purpose ↗
What knowledge must a driver demonstrate for a HazMat endorsement?
Correct answer: Identification, safe loading, placarding, and safe transportation
The H test covers recognizing, loading, placarding, and transporting hazardous material.
Source: Texas DL-7C, March 2026, section 9, PDF page 113: H endorsement ↗
Who determines the proper shipping name, ID number, hazard class, packing group, packaging, labels, and placards?
Correct answer: The shipper
The shipper classifies and prepares the material and certifies compliance.
Source: Texas DL-7C, March 2026, section 9, PDF page 113: Shipper duties ↗
What should a carrier do with a shipment that is improperly described, marked, labeled, or prepared?
Correct answer: Refuse it
The carrier checks preparation before transportation and refuses improper shipments.
Source: Texas DL-7C, March 2026, section 9, PDF page 113: Carrier duties ↗
What must a driver do with a leaking hazardous-material package?
Correct answer: Refuse the package or shipment
Drivers must reject leaking packages and follow all HazMat transport rules.
Source: Texas DL-7C, March 2026, section 9, PDF page 113: Driver duties ↗
Where may HazMat shipping papers be kept while the driver is behind the wheel?
Correct answer: Within reach while belted, and either readily visible or in the mounted driver-door holder
Immediate reach while restrained by the lap belt is required in both cases. The papers must also be readily visible to someone entering the cab or be in the inside driver-door holder.
Source: 49 CFR 177.817(e)(2)(i)(A)-(B): Reach while restrained, plus visibility or door holder ↗
Where should shipping papers be left when the driver exits the vehicle?
Correct answer: In the driver-door pouch or on the driver’s seat
The required location makes them quickly visible after an emergency.
Source: Texas DL-7C, March 2026, section 9, PDF page 126: Leaving the cab ↗
How many hazard classes are used in the HazMat system?
Correct answer: Nine
The regulations organize hazardous materials into nine classes.
Source: Texas DL-7C, March 2026, section 9, PDF page 114: Hazard classes ↗
What is the usual shape of a package hazard-warning label?
Correct answer: Diamond
The usual package hazard-warning label is a square positioned on a point, giving it a diamond shape.
Source: 49 CFR 172.407(c)(1): Diamond label; tag exceptions separately in 172.406(b) ↗
What is the required order of the basic HazMat description?
Correct answer: ID number, proper shipping name, hazard class or division, then packing group if assigned
Use this order for the basic description. A packing group is included only when one is assigned; not every hazardous material has one.
Source: Texas DL-7C, March 2026, section 9, PDF page 118: Shipping description ↗
Which is an authorized way to identify hazardous entries on a shipping paper that also lists nonhazardous freight?
Correct answer: Place an X before the basic description in a column headed HM
An X in the HM column is one method; RQ may replace it when appropriate. Other methods are listing hazardous entries first or using contrasting-color entries; highlighting is permitted on reproductions.
Source: 49 CFR 172.201(a)(1)(i)-(iii): Mixed-paper identification methods ↗
When an emergency-response telephone number is required on a shipping paper, who must provide it?
Correct answer: The shipper
The shipper supplies a number connected to a responsible emergency-information provider.
Source: Texas DL-7C, March 2026, section 9, PDF page 118: Emergency number ↗
What must accompany HazMat shipping papers?
Correct answer: Emergency-response information usable away from the vehicle
It includes hazards, precautions, firefighting, spill response, and first-aid information.
Source: Texas DL-7C, March 2026, section 9, PDF page 118: Emergency information ↗
A hazardous-waste shipping name does not already contain WASTE. What word must the shipper add before that name?
Correct answer: WASTE
Add WASTE before the proper shipping name when the name does not already contain it. The hazardous-waste manifest serves as a shipping paper.
Source: Texas DL-7C, March 2026, section 9, PDF page 118: Hazardous waste ↗
To whom may a driver deliver a hazardous-waste shipment?
Correct answer: The recipient designated under the manifest, with any change made under the applicable rules
Follow the manifest's designated facility or next transporter. Emergency or authorized changes have specific procedures; registration alone does not authorize delivery to an arbitrary recipient.
Source: 40 CFR 263.21(a)-(b): Designated recipient and authorized manifest changes ↗
What should a driver compare with the shipping paper before accepting HazMat?
Correct answer: Package markings and hazard labels
Shipping names, ID numbers, markings, and labels should agree.
Source: Texas DL-7C, March 2026, section 9, PDF page 119: Package comparison ↗
Where must placards normally be displayed on a vehicle?
Correct answer: On both sides and both ends
Placards must be visible, level, clean, undamaged, and on a contrasting background.
Source: Texas DL-7C, March 2026, section 9, PDF page 120: Placard position ↗
Which facts determine the placards required?
Correct answer: Hazards, packaging type, quantities aboard, and applicable placarding exceptions
Use the applicable placarding tables and exceptions. Bulk packaging and subsidiary hazards can change the result, so total weight alone is not enough.
Source: 49 CFR 172.504(a)-(f): General placarding, packaging, quantities and exceptions ↗
When must a Table 1 material be placarded?
Correct answer: Whenever any amount is transported
Table 1 hazards require placards at any quantity.
Source: Texas DL-7C, March 2026, section 9, PDF page 120: Table 1 ↗
For a non-bulk highway shipment of ordinary Class 3 and Class 8 materials with no other applicable exception, what total gross weight triggers placarding?
Correct answer: 1,001 pounds or more including packaging
Add the materials and their packaging. The ordinary Table 2 non-bulk threshold is 454 kg (1,001 lb). Bulk packaging, subsidiary hazards, and other regulatory exceptions are handled separately.
Source: 49 CFR 172.504(c): Non-bulk placarding threshold ↗
When may a DANGEROUS placard replace all separate Table 2 category placards on an otherwise qualifying mixed load?
Correct answer: For non-bulk packages needing different Table 2 placards, with no category at 2,205 lb or more loaded at one facility
DANGEROUS is optional for two or more non-bulk Table 2 categories requiring different placards. A category loaded at one facility at 1,000 kg (2,205 lb) or more must have its own placard. Bulk tanks do not qualify for this substitution.
Source: 49 CFR 172.504(b): DANGEROUS placard conditions ↗
Does the ordinary under-1,001-pound exception remove the placarding requirement for a material subject to the poison-inhalation-hazard placarding rule?
Correct answer: No; the required POISON INHALATION HAZARD or POISON GAS placard still applies
The weight exception does not apply to materials subject to 49 CFR 172.505. Use the appropriate required placard; the rules do not require duplicate poison-inhalation or poison-gas placards.
Source: 49 CFR 172.505(a), read with 172.504(c), (f)(8), (f)(11): Appropriate poison placard and no duplication ↗
With no applicable exception, must a bulk package containing only hazardous residue retain its required placards?
Correct answer: Yes
Residue is not automatically harmless or exempt. Keep the required placards unless cleaning, purging, or a specific regulatory exception permits their removal.
Source: 49 CFR 172.504(a), (d): Bulk residue and exceptions ↗
Which loading tool should not be used on HazMat packages?
Correct answer: A hook that could damage the container
Protect packaging from puncture or other damage during handling.
Source: Texas DL-7C, March 2026, section 9, PDF page 121: Loading tools ↗
How must hazardous-material packages be secured?
Correct answer: Brace them so they cannot fall, slide, or bounce
Movement can damage packages and fittings, so the load must be braced.
Source: Texas DL-7C, March 2026, section 9, PDF page 122: Securing cargo ↗
Which materials require special cargo-heater precautions and are normally kept out of a heated cargo space unless the rules are fully satisfied?
Correct answer: Explosives, flammable gas, and flammable liquids
Cargo heaters can create an ignition or heat hazard for Classes 1, 2.1, and 3.
Source: Texas DL-7C, March 2026, section 9, PDF page 122: Cargo heaters ↗
What floor-liner material is acceptable for Division 1.1, 1.2, or 1.3 explosives?
Correct answer: Nonmetallic material or nonferrous metal
The liner must be tight and must not contain iron or steel that can spark.
Source: Texas DL-7C, March 2026, section 9, PDF page 122: Explosive floor liner ↗
Which vertical loading rule applies to a package of nitric acid at 50% concentration or greater?
Correct answer: It must not be placed above a package of any other material
The federal loading rule prohibits placing nitric acid of at least 50% concentration above other materials. A leak could cause a dangerous reaction below.
Source: 49 CFR 177.839(a): Nitric acid concentration and placement ↗
What should cylinder supports prevent during transport of compressed gas?
Correct answer: Cylinders shifting or turning over
Use suitable racks, boxes or other compliant restraint for the cylinder design. Texas section 9.4.1 describes securing cylinders and keeping pressure-relief devices in the proper position. Follow the rules for the specific gas and cylinder.
Source: Texas DL-7C, March 2026, section 9, PDF page 123: Compressed gas cylinders ↗
May packages bearing or requiring POISON or POISON INHALATION HAZARD labels be carried with food or animal feed?
Correct answer: Only when the applicable packaging and segregation exception is fully satisfied
Do not treat ordinary separation as permission. The rule includes specified metal overpacks, separate closed unit-load devices, and a separate PG III condition. Poison-labeled packages are prohibited in the driver's compartment, including the sleeper.
Source: 49 CFR 177.841(e)(1)-(3): Food/poison exceptions and driver-compartment prohibition ↗
Under the handbook's general direct-attendance procedure, who must watch cargo-tank loading or unloading?
Correct answer: A qualified person must continuously attend the operation
The attendant must be alert, within 25 feet, able to see the tank, know the hazards and emergency procedures, and be authorized and able to move it. Specific regulatory attendance alternatives and exceptions require their own conditions.
Source: Texas DL-7C, March 2026, section 9, PDF page 124: Cargo tank watch ↗
Which distance from the traveled part of a public highway violates the parking rule for Division 1.1, 1.2, or 1.3 explosives?
Correct answer: 4 feet
Do not park on or within 5 feet of the traveled roadway. Being farther away does not by itself make parking lawful: separate rules cover property-owner consent and 300-foot separation from specified structures and gathering places.
Source: 49 CFR 397.7(a): Parking with explosives ↗
A cargo tank is transporting a flammable liquid. How far does the handbook’s no-smoking zone extend from the vehicle?
Correct answer: 25 feet
Smoking is prohibited on the vehicle and within 25 feet of it for this hazardous cargo.
Source: Texas DL-7C, March 2026, section 9, PDF page 126: No smoking ↗
How must a HazMat vehicle be refueled?
Correct answer: With the engine off and someone continuously controlling the nozzle
Continuous control and an off engine reduce ignition and spill risk.
Source: Texas DL-7C, March 2026, section 9, PDF page 126: Refueling ↗
What minimum extinguisher rating is required on a power unit transporting hazardous materials in a quantity requiring placarding?
Correct answer: 10 B:C
A power unit carrying a placard-required quantity needs a UL-rated extinguisher of at least 10 B:C. The rule is based on the required placarding, not merely a voluntarily displayed placard.
Source: 49 CFR 393.95(a)(1)(i): Placard-required hazardous-material quantity ↗
Under the hazardous-material driving rules, when must the driver examine each tire on a vehicle required to be marked or placarded?
Correct answer: At the start of every trip and each time the vehicle is parked
Check at trip start and whenever parked. Correct an unsafe tire condition before continuing, subject to the rule's limited allowance to reach the nearest safe repair place for a flat, leaking, or improperly inflated tire.
Source: 49 CFR 397.17(a)-(d), read with 397.1(a): Scope, examination, and tire-condition response ↗
At a railroad crossing with no legal stop exception, what must the driver of a placarded gasoline cargo tank do?
Correct answer: Stop 15 to 50 feet from the nearest rail, then look and listen before crossing
Stop at the required distance. Proceed only when no train is approaching and the entire vehicle can clear. Do not change gears on the tracks.
Source: Texas DL-7C, March 2026, section 9, PDF page 127: Railroad crossings ↗
What should a driver do when HazMat is leaking from the vehicle?
Correct answer: Park safely, secure the area, stay upwind, remain there, and call for help
Do not spread contamination, repack leaks, or use smell to identify material.
Source: Texas DL-7C, March 2026, section 9, PDF page 127: Leak response ↗
A HazMat trailer has hot doors and a suspected cargo fire. What should the driver do?
Correct answer: Keep the doors closed, move people away, and call for emergency help
Opening the doors can feed the fire and cause a flare-up. Do not approach or fight a hazardous cargo fire without the required training and equipment. Keep shipping information available for responders from a safe location.
Source: Texas DL-7C, March 2026, section 9, PDF page 127: Cargo fire ↗
A HazMat incident during transportation causes an injury requiring hospital admission. How soon must the NRC be notified?
Correct answer: As soon as practical, but no later than 12 hours after the incident
When the injury directly results from the hazardous material, call the NRC as soon as practical and within 12 hours. Do not delay beyond securing the scene safely. The written incident report is a separate requirement.
Source: 49 CFR 171.15(a), (b)(1)(ii): Immediate NRC notice ↗
Which packing group indicates the highest degree of danger among assigned groups?
Correct answer: Packing Group I
Assigned packing groups progress from greater danger in I to lower danger in III.
Source: PHMSA Hazmat Transportation Requirements: Performance Packaging Codes, packing groups ↗
Must a shipper invent a packing group for a Class 2 gas when none is assigned?
Correct answer: No, Class 2 does not have packing groups
A packing-group field is not universally applicable to all hazard classes.
Source: PHMSA Hazmat Transportation Requirements: Performance Packaging Codes, packing groups ↗
Why does a hazmat employee need function-specific training?
Correct answer: To learn requirements applicable to the work they actually perform
Training must address the employee’s regulated duties, not just general hazard recognition.
Source: 49 CFR 172.704(a)(2) ↗
Which topic belongs in required hazmat security-awareness training?
Correct answer: Recognizing possible security threats and appropriate responses
The training addresses transportation security risks as well as awareness of threats.
Source: 49 CFR 172.704(a)(4) ↗
What is the maximum normal interval between recurrent hazmat employee training under this rule?
Correct answer: Three years
Required recurrent training occurs at least every three years; relevant security-plan revisions can trigger earlier training.
Source: 49 CFR 172.704(c)(2) ↗
What route document must a driver carrying Division 1.1, 1.2, or 1.3 explosives possess and follow?
Correct answer: The required written route plan
The written plan is a required transport document, not a convenience suggestion.
Source: Texas DL-7C, March 2026, section 9, PDF page 126: Explosives route documents ↗
What must carrier-provided emergency instructions for these explosives identify?
Correct answer: Contacts, the explosives involved, and emergency precautions
The instructions prepare the driver for accidents, delays, fires, and leaks.
Source: Texas DL-7C, March 2026, section 9, PDF page 126: Explosives emergency instructions ↗
Compressed gas leaks after a transport accident. What should you do about bystanders?
Correct answer: Warn them and keep them away from the hazard
Only appropriately involved response personnel should approach; notify the shipper about the accident.
Source: Texas DL-7C, March 2026, section 9, PDF page 128: Compressed-gas leak ↗
A radioactive package leaks inside a vehicle. Is removing visible material enough before reusing it?
Correct answer: No, it must be cleaned and checked with a survey meter
Keep clear of the material, notify the responsible supervisor, and require proper assessment before reuse.
Source: Texas DL-7C, March 2026, section 9, PDF page 128: Radioactive contamination ↗
An infectious-substance package shows damage and leakage before acceptance. What should you do?
Correct answer: Do not accept it; contact the responsible supervisor
Damaged or leaking infectious-material packaging must not simply be put into transport.
Source: Texas DL-7C, March 2026, section 9, PDF page 128: Infectious packages ↗
