SD DMV South Dakota Traffic Laws — Questions and Answers
Question 1: What is the legal blood alcohol concentration limit for drivers 21 and over in South Dakota?
- 0.08% (Correct answer)
- 0.10%
- 0.05%
- 0.02%
Correct answer: 0.08%
South Dakota sets the legal BAC limit at 0.08% for drivers aged 21 and older, consistent with the national standard.
Question 2: In South Dakota, what must you do when approaching a stopped school bus with flashing red lights?
- Stop regardless of your direction of travel unless separated by a physical median (Correct answer)
- Stop only if traveling in the same direction
- Slow down and pass carefully
- Honk to alert children
Correct answer: Stop regardless of your direction of travel unless separated by a physical median
South Dakota law requires all traffic from both directions to stop for a school bus with activated red flashing lights, unless separated by a physical barrier.
Question 3: What is the maximum speed limit on South Dakota interstate highways?
- 80 on interstate mph (Correct answer)
- 55 mph
- 85 mph
- 60 mph
Correct answer: 80 on interstate mph
The maximum speed limit on South Dakota interstate highways is 80 on interstate mph, though lower limits may be posted in urban areas and construction zones.
Question 4: In South Dakota, when must you turn on your headlights?
- From sunset to sunrise and when visibility is reduced (Correct answer)
- Only after midnight
- Only during heavy rain
- Only on highways
Correct answer: From sunset to sunrise and when visibility is reduced
South Dakota requires headlights from sunset to sunrise and when visibility is reduced by weather conditions such as rain, fog, or snow.
Question 5: What is South Dakota's implied consent law?
- By driving, you consent to chemical testing if lawfully arrested for impaired driving (Correct answer)
- You consent to vehicle searches at any time
- You consent to speed checks
- You consent to having your vehicle impounded
Correct answer: By driving, you consent to chemical testing if lawfully arrested for impaired driving
South Dakota's implied consent law means that by operating a motor vehicle, you automatically agree to submit to chemical testing if lawfully arrested for driving under the influence.
Question 6: What are the seat belt requirements in South Dakota?
- Secondary enforcement (Correct answer)
- No seat belt law exists
- Only drivers must wear seat belts
- Seat belts are optional for all adults
Correct answer: Secondary enforcement
South Dakota's seat belt law requires occupants to be properly restrained while the vehicle is in motion.
SD DMV South Dakota Traffic Laws
What is the legal blood alcohol concentration limit for drivers 21 and over in South Dakota?