Nevada CDL — General Knowledge practice
Nevada CDL — General Knowledge: Alcohol & Drugs 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
14 questions · pass with 11 correct. You get instant feedback and an explanation after every answer.
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12 sample Alcohol & Drugs 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. Which group does research identify as being at increased risk of a fall-asleep crash?
Correct answer: Shift workers
Higher-risk groups include shift workers, young men, long-haul and other commercial drivers, plus anyone with an untreated sleep disorder or chronic lack of sleep.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
2. How does working more than 60 hours a week affect a driver's risk of a fatigue-related crash?
Correct answer: It raises the risk by 40 percent
Among the fatigue risk factors the manual lists, a work week of more than 60 hours raises crash risk by 40%.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
3. Which step does the manual recommend for preventing drowsiness before a trip?
Correct answer: Plan driving for the times of day you're usually awake
Prevention tips include getting enough sleep, planning the route, scheduling trips for your normal waking hours, driving with a passenger, and avoiding medicines that cause drowsiness.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
4. To stay alert, about how much sleep does the manual say adults need?
Correct answer: 8 to 9 hours
Adequate sleep is the first step in preventing drowsiness before a trip, and adults need 8 to 9 hours to stay alert.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
5. What did the NTSB report about crashes in which a truck driver was killed?
Correct answer: Drowsiness was the likely cause in over half of them
The NTSB found drowsy driving was probably behind more than half of the crashes that killed a truck driver, and three to four other people die for each truck driver killed.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
6. If you can do it safely, what quick self-check does the manual suggest when you wonder whether you're too sleepy to drive?
Correct answer: Check your face in a mirror, and stop driving if you look or feel sleepy
Drivers often misjudge how near they are to falling asleep. If you look sleepy in a mirror, or simply feel sleepy, stop; the only safe cure is sleep.
Source: Nevada Commercial Driver's License Manual — Section 2.11.5, Night Driving Procedures
7. You're scheduled for a solo overnight run on a long, dark rural highway. Why does the manual flag a trip like this?
Correct answer: Being alone on a long, dark, boring road raises drowsy-driving risk
Before driving, weigh your fatigue risk. The risk list includes driving at night or when you'd usually be sleeping, and driving by yourself on long, rural, dark, or monotonous roads.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
8. NHTSA estimates that about how many police-reported crashes each year result from drowsy driving?
Correct answer: 100,000
Drowsy driving is among the leading causes of collisions. NHTSA estimates it leads to 100,000 police-reported crashes a year.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
9. For each truck driver killed in a crash, about how many other people are killed?
Correct answer: Three to four
The manual cites NHTSA data that each truck driver fatality is accompanied by the deaths of three to four other people.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
10. A federal study followed 80 long-haul truckers in the U.S. and Canada. On average, how much did they sleep per day?
Correct answer: Less than 5 hours
That congressionally mandated study found the drivers averaged under 5 hours of sleep a day.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
11. Besides nighttime, when is sleepiness most pronounced, making drowsy-driving crashes more likely?
Correct answer: Mid-afternoon
Drowsy-driving crashes cluster when sleepiness peaks, which is at night and again in the mid-afternoon.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
12. You catch yourself nodding off for just a second or two at a time while driving. How does the manual describe this?
Correct answer: Even brief bursts of sleep make a collision dramatically more likely
Drowsy drivers may doze in bursts of just a few seconds or for longer stretches. Either way, the odds of a collision rise dramatically, so stop and rest.
Source: Nevada Commercial Driver's License Manual — Section 2.11.2, Driver Factors
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