Under these conditions the max mph over the posted speed limit is authorized.

• A. 10 mph
• B. 20 mph
• C. 5 mph
• D. 30 mph

Answer: (B)

When responding in an emergency, you’re allowed to exceed the posted speed limit by a fixed margin to improve your reach to the scene, but only up to a set limit. The standard authorized margin in these conditions is twenty miles per hour over the posted limit. This keeps a balance between speeding up response times and maintaining a reasonable level of safety for you and others on the road.

If you drive with lights and sirens and the roadway is clear and conditions permit, up to twenty mph over the limit can be used to gain critical time. Smaller margins like five or ten mph might not provide the needed advantage, while a margin of thirty mph over the limit is typically beyond what’s authorized and would raise the risk of loss of control, longer stopping distances, and greater crash potential. Remember, if conditions are poor—heavy traffic, rain, darkness, or poor visibility—the margin is not to be relied on, and you should stay closer to the limit or adjust to safer speeds.