A shipper uses an outside emergency-response telephone service. What associated identification must appear as prescribed on the paper?
Correct answer: The registered person's name or assigned contract or unique identifier.
The provider needs to link the call to the registered person's current shipment information. Placement and prominent-identification alternatives are specified in the rule.
Source: 49 CFR 172.604(b)(2). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
Can emergency-response information be kept in a separate guidance document?
Correct answer: Yes, if it is properly cross-referenced to the shipment description.
A separate document is allowed when the shipping description is cross-referenced to the correct emergency information. A guide for an unrelated material is not enough.
Source: 49 CFR 172.602(b)(3)(iii). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
Which information must be included in the required emergency-response information?
Correct answer: Health hazards, fire risks and preliminary first-aid measures.
The required information also includes the material description, immediate precautions, and initial methods for fires, spills and leaks. It must be immediately accessible for an incident.
Source: 49 CFR 172.602(a), (c). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
Required hazardous-material papers are carried with other paperwork. How should the driver distinguish them?
Correct answer: Use a distinctive tab or put them first.
Readily recognizable shipping papers help authorities during accidents and inspections. This is distinct from marking hazardous entries within one mixed shipping paper.
Source: 49 CFR 177.817(e)(1). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
For a non-waste hazardous-material shipment, how long must a receiving motor carrier retain the required shipping-paper copy?
Correct answer: One year after the carrier accepts the material.
The receiving carrier's ordinary non-waste retention period is one year; hazardous waste has a three-year period. Providers of shipping papers have a different two-year non-waste requirement under 172.201(e).
Source: 49 CFR 177.817(f); compare 172.201(e). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
Absent an applicable exception, where must required placards be displayed on a transport vehicle containing hazardous materials?
Correct answer: On each side and each end.
The general rule specifies each side and each end, with the placards appropriate to the material. Other provisions contain visibility, combination-vehicle and packaging exceptions.
Source: 49 CFR 172.504(a). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
A highway shipment contains 200 pounds of Division 4.3 material with no applicable exception. Does being below 1,001 pounds remove its placarding requirement?
Correct answer: No; Division 4.3 is in Table 1.
Division 4.3 is a Table 1 hazard. The general less-than-1,001-pound exception for certain Table 2 non-bulk loads does not apply.
Source: 49 CFR 172.504(a), (c), (e) Table 1. Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
A truck carries 900 pounds aggregate gross weight of ordinary Class 3 material in non-bulk packages. No subsidiary-hazard or other special requirement applies. What does 172.504(c) permit?
Correct answer: Transport without a placard under the stated weight exception.
The exception is for less than 1,001 pounds aggregate gross weight of Table 2 hazardous material in the stated circumstances. It does not erase other hazardous-material requirements.
Source: 49 CFR 172.504(c). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
When applying the Table 2 aggregate gross-weight placarding threshold, does packaging weight count?
Correct answer: Yes; gross weight includes packaging and contents.
The threshold uses the gross weight of the hazardous packages, not merely net product weight or the vehicle's own weight.
Source: Colorado Commercial Driver License Manual (06/15/23), Section 9.8, Gross weight or gross mass; 172.504(c), physical PDF page 106. Reviewed September 14, 2026. ↗
Can a bulk package rely on the general less-than-1,001-pound Table 2 placarding exception merely because it contains little material?
Correct answer: No; that exception expressly excludes bulk packagings.
Bulk-packaging and special subsidiary-hazard rules must be checked separately. The non-bulk aggregate-weight exception is not a general small-residue exemption for tanks.
Source: 49 CFR 172.504(c), (d). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
A vehicle carries qualifying non-bulk packages from two Table 2 categories requiring different placards. Neither category reaches 2,205 pounds loaded at one facility. Which option may be available?
Correct answer: A DANGEROUS placard instead of their separate Table 2 placards.
172.504(b) allows the DANGEROUS option for the stated mixed non-bulk Table 2 load. It does not replace Table 1 or other separate requirements.
Source: 49 CFR 172.504(b). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
A qualifying mixed non-bulk load uses DANGEROUS placards. One facility loads 2,300 pounds aggregate gross weight of Class 8 material. What additional category display is required?
Correct answer: The CORROSIVE placard for that category.
When at least 2,205 pounds of one Table 2 category is loaded at one facility, its specified category placard must be applied.
Source: 49 CFR 172.504(b). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
For a domestic Class 9 shipment in bulk packaging, what is true even though a CLASS 9 placard is not required?
Correct answer: The bulk packaging still needs the appropriate identification-number marking.
The domestic placard exception does not remove bulk identification marking. The number can appear on the authorized Class 9 placard, orange panel or white square-on-point display.
Source: 49 CFR 172.504(f)(9). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
How far must a placard be from advertising or other markings that could reduce its effectiveness?
Correct answer: At least 3 inches.
172.516(c)(4) requires separation from interfering markings and in any case at least three inches.
Source: 49 CFR 172.516(c)(4). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
For a tractor and cargo body, may the required front placard be displayed on the front of the truck-tractor?
Correct answer: Yes; it may be there instead of or in addition to the cargo-body front.
The rule expressly allows the required front display on the tractor. Other applicable placarding and visibility requirements remain.
Source: 49 CFR 172.516(b). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
A tool could damage a hazardous package's closure during unloading. Should it be used?
Correct answer: No; use handling equipment that will not damage containment.
Tools likely to impair a package or its closure must not be used. The restriction concerns damaging tools, not a blanket ban on handling equipment.
Source: 49 CFR 177.834(f). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
A cargo-tank unloading operation uses the ordinary in-person attendance method, with no special exception or alternative system. How close must the qualified person remain?
Correct answer: Within 25 feet of the cargo tank.
The ordinary method requires the qualified person within 25 feet, alert, and with the prescribed unobstructed view to the maximum extent practicable. Authorized alternative methods and product-specific exceptions have their own conditions.
Source: 49 CFR 177.834(i)(3)(i). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
For ordinary in-person cargo-tank attendance, which person is qualified?
Correct answer: One trained for the hazards and emergencies and able and authorized to move it.
The attendant must know the material's hazards and emergency procedures and have authority and means to move the tank under this attendance method.
Source: 49 CFR 177.834(i)(4). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
An approved remote cargo-tank monitoring system loses its monitoring capability during transfer. What must happen?
Correct answer: Terminate transfer immediately and restore compliant attendance.
The remote-system alternative requires immediate termination on loss of monitoring capability. A qualified person must immediately resume the required in-person attendance after remote-system failure.
Source: 49 CFR 177.834(i)(3)(ii)(C), (E). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
A placarded vehicle requires attendance. The attendant is outside, 80 feet away, but a building blocks the view. Does this meet the attendance definition?
Correct answer: No; the vehicle must be in unobstructed view.
An outside attendant must be within 100 feet and have an unobstructed view. On the vehicle, the attendant must be awake and not in a sleeper berth.
Source: 49 CFR 397.5(d)(1). Official eCFR XML dated September 10, 2026; reviewed September 14, 2026. ↗
