Colorado Motorcycle practice
Colorado Motorcycle: Alcohol, Drugs & Impairment practice test
Blood alcohol limits, zero-tolerance and implied-consent laws, and how alcohol and drugs — legal or not — affect your driving.
Content reviewed against official driver handbooks · August 12, 2026
12 questions · pass with 10 correct. You get instant feedback and an explanation after every answer.
Study questions with answers
12 sample Alcohol, Drugs & Impairment questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
Show all 12 questions with answers
1. A rider charged with impaired driving explains that the marijuana was taken for a medical reason. Under Colorado law, that explanation:
Correct answer: Does not excuse the offense
Using marijuana or another drug for medicinal purposes is no defense at all to a DUI or DWAI charge.
Source: Colorado Driver Handbook - Driving Under the Influence (Drugs and Driving)
2. Once alcohol has reached the bloodstream, what actually brings a person's BAC back down?
Correct answer: Time alone, at an average of about 0.015% per hour
Nothing speeds the process up; the body clears alcohol on its own schedule, and BAC falls by roughly 0.015% for every hour that passes.
Source: Colorado Driver Handbook - Driving Under the Influence
3. Which statement about a standard drink is accurate?
Correct answer: A can of beer, a glass of wine and a shot of spirits each carry about the same amount of alcohol
Twelve ounces of beer, five ounces of wine and an ounce and a half of distilled spirits each deliver roughly the same quantity of alcohol.
Source: Colorado Driver Handbook - Driving Under the Influence
4. For a rider younger than 21, a license can be revoked when blood alcohol concentration goes over:
Correct answer: 0.02%
Drivers under 21 face revocation above 0.02%, a far lower threshold than the 0.08% that applies to adults, and 0.04% governs commercial drivers.
Source: Colorado Driver Handbook - Driving Under the Influence
5. Two riders drink the same amount over the same evening, yet their blood alcohol levels differ. Why?
Correct answer: Body weight, sex, and how long ago the last drink was finished
BAC depends on how much was consumed, the drinker's body weight and sex, how long the drinking lasted, and how much time has passed since the final drink.
Source: Colorado Driver Handbook - Driving Under the Influence
6. Colorado's open container rule covers the passenger area of a vehicle on a public road. Which substances does it reach?
Correct answer: Both alcohol and marijuana
Carrying an opened container of either alcohol or marijuana in the passenger area of a vehicle on a public roadway is against the law.
Source: Colorado Driver Handbook - Driving Under the Influence
7. Under Colorado's express consent law, refusing the chemical test an officer requests costs you your license for how long?
Correct answer: One year
A refusal revokes the license for one year and also forces an ignition interlock onto any vehicle you drive for the following two years.
Source: Colorado Driver Handbook - Driving Under the Influence (Express Consent Law)
8. What do Colorado's figures show about polydrug impairment, meaning impairment by two or more substances at once?
Correct answer: It turns up more often than impairment caused by any lone drug apart from alcohol, and it is more dangerous
State figures show polydrug impairment occurring more often than impairment caused by any lone drug apart from alcohol, and it carries greater danger.
Source: Colorado Driver Handbook - Driving Under the Influence (Polydrug Impairment)
9. A Colorado driver can be convicted of DUI per se once blood alcohol concentration rises above what level?
Correct answer: 0.08%
DUI per se rests on the number itself: a BAC above 0.08% supports the charge without any further proof of impaired behavior.
Source: Colorado Driver Handbook - Driving Under the Influence
10. In Colorado, what separates a DWAI charge from a DUI charge?
Correct answer: DWAI means impairment to even the slightest degree, while DUI means the driver is substantially unable to drive safely
DWAI covers a driver impaired even to the slightest degree, while DUI describes a driver who is substantially unable to operate the vehicle safely.
Source: Colorado Driver Handbook - Driving Under the Influence
11. What does an ignition interlock device actually do?
Correct answer: It requires a breath sample before the engine will start, then asks for more samples as you drive
The interlock wants a breath sample before it will let the engine fire, and it asks for further samples at intervals during the trip; an elevated reading keeps the vehicle from starting.
Source: Colorado Driver Handbook - Driving Under the Influence (Express Consent Law)
12. Colorado law creates a permissible inference that a driver was under the influence when the blood holds how much THC?
Correct answer: 5 nanograms per milliliter
Five nanograms of THC in each milliliter of blood supports a permissible inference of DUI; no comparable inference level exists for DWAI.
Source: Colorado Driver Handbook - Driving Under the Influence (Drugs and Driving)
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