US Speed Limits

What’s inside

• Who generally determines the posted speed limits on most roads in the United States?
• What does a standard posted speed-limit sign generally indicate?
• How does an advisory speed plaque on a curve usually differ from a regulatory speed-limit sign?
• Which statement best describes speed limits in school zones in the United States?
• Which statement about speed limits on U.S. interstate highways is accurate?
• Why might a heavy truck have to travel at a lower posted speed than a passenger car on the same road?
• A U.S. speed-limit sign is generally a regulatory sign, meaning that its limit can be legally enforced.
• All U.S. states use identical maximum speed limits on interstate highways.