Default speed limits by area type, safe speed for conditions, the 3-4 second rule, stopping distance, and reaction time.
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- What is the default speed limit in residential areas?
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25 mph- What is the typical default speed limit on rural highways?
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55 mph- Speed limit in a school zone
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15-25 mph (varies by location)- Typical speed limit in a construction zone
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25-35 mph- What is the typical default speed limit in urban or downtown areas?
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25-35 mph- What is the minimum speed limit on a divided highway or interstate?
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45-50 mph (varies by jurisdiction)- What is the maximum speed limit on most US highways?
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65-70 mph- State the three-second rule for following distance
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Maintain at least 3 seconds of distance between your vehicle and the one ahead- When should you use the 4-second rule instead of the 3-second rule?
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In poor weather, bad visibility, night driving, or following large trucks- How do you measure the 3-second rule in practice?
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Pick a fixed object the car ahead passes, count the seconds until you reach it; should take at least 3 seconds- List conditions when a 4-second following distance is required
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Rain, snow, ice, fog, night driving, when following large vehicles, or when tired- At 55 mph, what is the following distance in terms of car lengths (approximately)?
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Approximately 6 car lengths- At 35 mph, what is the following distance in terms of car lengths (approximately)?
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Approximately 4 car lengths- What is the recommended following distance behind a truck or bus?
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Increase it to 4 seconds or more; trucks need more distance to stop- What special following distance rule applies at night?
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Increase your following distance to at least 4 seconds due to reduced visibility
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