What is the maximum speed limit on major highways?

Answer: B — 70 mph

The maximum speed limit on major highways is typically 70 mph. This speed limit is set to allow for safe travel while still maintaining an efficient flow of traffic. Both options A and D of 65 and 60 mph are typically not the maximum allowed speed unless otherwise posted. Option C of 55 mph is a common speed limit for smaller roads and residential areas, but not major highways.