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What is the maximum speed limit on an expressway or highway unless otherwise posted?

  1. 50 mph

  2. 55 mph

  3. 60 mph

  4. 65 mph

The correct answer is: 65 mph

The maximum speed limit on an expressway or highway unless otherwise posted is generally 65 mph. This is because expressways and highways are usually designed for high-capacity, high-speed travel and have multiple lanes, so a speed limit higher than 65 mph is necessary for traffic to flow smoothly and safely. Options A, B, and C are all incorrect because they are below the standard highway speed limit of 65 mph and would likely cause traffic congestion and increase the risk of accidents. Additionally, it is important to note that some states may have different maximum speed limits for expressways and highways, so it is always best to follow local speed limit signs and regulations while driving.