Colorado Hazardous Materials CDL Practice Test
Below are 25 exam-style questions for the Colorado Hazardous Materials CDL knowledge test, modeled on the FMCSA-aligned content used by the Colorado Department of Revenue Division of Motor Vehicles. Try to answer each question on your own before reading the answer key directly under it. The questions and answer choices are shuffled deterministically per state and endorsement, so the order will stay the same on repeat visits — that lets you genuinely measure your improvement.
- A Help drivers move faster
- B Communicate the risk, contain the materials, and protect the public
- C Reduce fuel use
- D Provide tax revenue
- A Bulk quantities or any amount of certain Table 1 materials
- B Only at night
- C Only liquids
- D Any quantity of any hazardous material
- A Vehicle without working brake lights or in unsafe condition
- B Truck designed for the specific class
- C Vehicle in compliance with HMR
- D Properly placarded trailer
- A Refuse the load and notify the carrier — the shipper must use a proper shipping name
- B Use the closest entry
- C Skip the placards
- D Use a generic placard
- A Two or more separate placards on a load that contains different hazard classes (Table 2 materials only)
- B Never
- C Only on Class 1 explosives
- D Any single placard
- A Cargo that may be harmful to aquatic life and requires special marking
- B Bulk shipments
- C Hazardous waste only
- D Only liquids in port areas
- A Open the cargo doors to ventilate
- B Try to put it out with water
- C Drive the vehicle to a safe place
- D Stay upwind, evacuate the area, and let trained responders handle it
- A Only if the receiver requests it
- B Yes — they should be readily identifiable for emergency responders
- C No — mix them in with other paperwork
- D Only on long trips
- A Cargo tank vehicles only
- B Drivers, not cargo
- C Class 1 explosives, to determine which can be loaded together
- D All hazmat materials
- A Take a break first
- B Drive to the destination immediately
- C Allow shipper to drive away
- D Verify shipping papers, placards, and securement before leaving the loading site
- A The shipper guarantees the load is properly classified, packaged, marked, labeled, and described per regulations
- B The driver has training
- C The receiver has paid
- D The carrier has insurance
- A During the trip if you stop
- B Before leaving the loading site
- C In an emergency
- D All of the above
- A X (combination of H and N for tank vehicles carrying hazardous materials)
- B A medical card upgrade
- C A pilot car
- D A separate trailer license
- A Five
- B Twelve
- C Nine
- D Seven
- A Within 10 feet only
- B At 50 and 100 feet
- C Only at night
- D At 10, 100, and 200 feet from the vehicle
- A Are unrestricted
- B Must be operated by the receiver
- C May only be used after 6 p.m.
- D Must meet special standards or be turned off
- A Park near a fire
- B Park within 5 feet of a road
- C Park near an open flame
- D All of the above
- A Take the most direct route regardless of restrictions
- B Avoid weigh stations
- C Have a written route plan if required by the shipper or by federal/state rules
- D Drive at night only
- A Loaded only by the receiver
- B Inspected once a year only
- C Bonded and grounded during loading and unloading
- D Loaded only at night
- A A placard for a small load only
- B A placard for state-only highways
- C A placard for the trailer interior
- D A placard for an additional hazard the material poses besides the primary hazard
- A Cargo cannot shift, leak, or be exposed to ignition sources
- B Cargo blocks emergency exits
- C They can shift freely
- D Containers can rub against each other
- A Verify markings, labels, placards, papers, and securement before signing for it
- B Wait for an inspector
- C Trust the shipper without checking
- D Only sign and drive
- A Protect yourself and isolate the area
- B Contain the spill
- C Check the load for leaks first
- D Call your dispatcher only
- A Drive only between 8 a.m. and 6 p.m.
- B Have written instructions on what to do in case of accident or delay
- C Avoid Class A highways only
- D Travel with a state escort
- A Cover the explosives with the liquids
- B Load them in the same compartment
- C Check the segregation table — many combinations are forbidden
- D Always keep them together
Study tips for the Colorado Hazardous Materials exam
The Hazardous Materials portion of the Colorado CDL exam is graded out of the bank of questions the Colorado Department of Revenue Division of Motor Vehicles draws from each year. While the exact bank is not published, every question is sourced from the Hazardous Materials chapter of the Colorado CDL handbook, which itself is derived from the FMCSA Model Commercial Driver's License Manual. That means studying our practice tests, reading the corresponding handbook chapter, and re-reading the parts you got wrong is genuinely the most efficient route to a first-time pass.
Most successful applicants follow a simple cycle: take the practice test cold, write down every question you missed, open the matching chapter of the official Colorado handbook, re-read the section that contains the right answer, then re-take the practice test 24 to 48 hours later. The 24-hour delay matters — sleep is when your brain commits new information to long-term memory, and CDL knowledge questions reward that kind of consolidated learning rather than cramming.
Pay particular attention to questions that include qualifier words like always, never, only, primary, or most. CDL test writers love to flip the right answer with a single qualifier. When two answer choices look almost identical, pay attention to the verb (is it must, should, or may?) and to any numbers (14 days, 100 air miles, 8 hours, 70/8 split). On endorsement tests in particular, watch for trick framing where a true statement about a different endorsement is offered as the "correct" answer to a question that is actually about Hazardous Materials.
Test-day logistics matter too. Bring photo ID, your Social Security card or birth certificate, your medical examiner's certificate (DOT card), and proof of state residency if you haven't already submitted those documents. The Colorado Department of Revenue Division of Motor Vehicles will not let you sit for the knowledge exam without your documentation, and most offices charge an additional fee for re-attempts. Arrive early — the wait at most CDL testing offices runs 30 to 60 minutes — and silence your phone before the exam begins.
Finally, keep your General Knowledge fundamentals sharp even when you're focused on the Hazardous Materials exam. Many states administer multiple knowledge tests in a single sitting, and questions on weight definitions (GVWR, GCWR, GAWR), stopping distance, and the pre-trip inspection routine show up across endorsements. If you're unsure on the basics, sit a fresh Colorado General Knowledge practice test before scheduling the real exam.
Next steps
Missed more than four questions? Re-read the Hazardous Materials study guide and the matching chapter in the official Colorado CDL handbook. Then come back and re-take the test. Once you can score 22 of 25 or higher on three runs in a row, you're in good shape to schedule the real exam at your local Colorado Department of Revenue Division of Motor Vehicles office.
Already comfortable with this endorsement? Drill another: CO General Knowledge · CO Air Brakes · CO Combination Vehicles · CO Passenger · CO School Bus · CO Tank Vehicle · CO Doubles / Triples
New to the CDL process in Colorado? Read How to apply for a CDL in Colorado for the document checklist and step-by-step timeline.