Idaho CDL — General Knowledge practice
Idaho CDL — General Knowledge: Traffic Laws practice test
Speed limits, turning and signaling rules, headlight and seat-belt requirements, and the everyday laws every driver must follow.
Content reviewed against official driver handbooks · August 12, 2026
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12 sample Traffic Laws questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. Idaho's Seasonal CDL generally can't be used to haul placarded hazardous materials. Which load is among the exceptions the manual lists?
Correct answer: Up to 1,000 gallons of diesel fuel
The exceptions are diesel fuel up to 1,000 gallons, liquid fertilizer in vehicles or implements holding no more than 3,000 gallons in total, and solid fertilizers that aren't mixed or carried with organic substances.
Source: Idaho Commercial Driver's License Manual — Seasonal CDL for Farm-Related Services
2. An Idaho driver runs a custom motorcoach rated above 26,001 pounds for commercial purposes, carrying only eight people. What does the manual require?
Correct answer: A CDL with a passenger endorsement
A special note says anyone operating a custom motorcoach commercially above that weight needs a CDL with a passenger endorsement, even when the coach is built or used for fewer than 16 passengers.
Source: Idaho Commercial Driver's License Manual — Commercial Vehicle Exemptions
3. Idaho's manual carries a notice about the identification TSA needs to process a hazardous materials endorsement. What does it say?
Correct answer: TSA requires multiple documents, for example an Idaho driver's license together with a birth certificate or a U.S. passport
The notice says TSA wants more than one identification document, for example an Idaho license together with a birth certificate or a passport, and may insist on a plastic license instead of a paper temporary. It points to the TSA website for current requirements.
Source: Idaho Commercial Driver's License Manual — Section 9, Hazardous Materials
4. The holder of an Idaho Seasonal CDL is offered harvest work pulling a Class A tractor-trailer. What does the manual say?
Correct answer: It is not allowed; Class A combination vehicles are outside what the seasonal CDL covers
The seasonal CDL cannot be used for Class A (combination) vehicles, and it also excludes passenger vehicles built for 16 or more people counting the driver.
Source: Idaho Commercial Driver's License Manual — Seasonal CDL for Farm-Related Services
5. Gravel is on Idaho's Exempt Commodities List, but with a note attached. What does the note say?
Correct answer: The unloading equipment pulled behind the truck is still regulated
The gravel entry, like those for dirt, rock, sand and topsoil, notes that equipment pulled behind the truck for unloading the material is regulated.
Source: Idaho Commercial Driver's License Manual — Exempt Commodities List
6. Where does Idaho's manual say you can complete the medical self-certification for your CDL?
Correct answer: At a county driver's license office or online on the ITD website
Self-certification can be handled in person at a county licensing office, or done online by the driver through the ITD website.
Source: Idaho Commercial Driver's License Manual — Section 1.2, Medical Documentation Requirements
7. Idaho's manual lists four categories of CDL exemptions. Which of these is NOT one of them?
Correct answer: Construction vehicle exemption
The four categories are the recreational vehicle, military vehicle, emergency vehicle and farm vehicle exemptions. Construction vehicles are not an exemption category.
Source: Idaho Commercial Driver's License Manual — Commercial Vehicle Exemptions
8. Idaho's farm vehicle exemption covers qualifying trips within 150 miles of the farm. What happens when such a trip crosses into a neighboring state?
Correct answer: The exemption applies only if a current reciprocity agreement is in effect between the states
The manual says the farm exemption stops at Idaho's borders unless the two states currently have a reciprocity agreement in effect.
Source: Idaho Commercial Driver's License Manual — Commercial Vehicle Exemptions
9. What does Idaho's Exempt Commodities List allow an Idaho-only CDL holder to do when hauling a listed commodity?
Correct answer: Transport it without having a DOT medical card in possession
The list names the commodities that CDL holders operating only in Idaho may legally haul without carrying a DOT medical card.
Source: Idaho Commercial Driver's License Manual — Exempt Commodities List
10. A farmer hauls a neighbor's crop to market and is paid for the trip. How does Idaho's farm vehicle exemption treat this?
Correct answer: It does not apply, because the farmer is being compensated to haul another farmer's products
The exemption is meant for small farm-to-market operations. It leaves out farmers who carry another farmer's products and get paid anything for doing so.
Source: Idaho Commercial Driver's License Manual — Commercial Vehicle Exemptions
11. Who qualifies for the military vehicle exemption described in Idaho's CDL manual?
Correct answer: Active-duty personnel operating military vehicles, plus uniformed civilians who fall under the Code of Military Justice
The exemption covers people operating military vehicles who are active-duty personnel, and also civilians who are required to be in uniform and who answer to the Code of Military Justice.
Source: Idaho Commercial Driver's License Manual — Commercial Vehicle Exemptions
12. A shipper asks your bus line to carry 150 pounds of a single class of otherwise-allowed hazardous material. What does the manual's limit say?
Correct answer: Not allowed; the cap is 100 pounds for any single class
A bus may never carry over 500 pounds of allowed hazardous materials in total, and within that total each class is capped at 100 pounds.
Source: Idaho Commercial Driver's License Manual — Section 4.2.2, Forbidden Hazardous Materials
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