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It can be from 60 to 85 mph.
70mph on some rural interstate highways
70
The maximum speed limit in Florida is 55 mph, except where otherwise posted. Speed limits are 70 mph on some rural interstate highways.
It is important to drive safely. The speed limit on a rural interstate highway is usually set somewhere between 65 miles per hour and 80 miles per hour.
The maximum speed limit on the highway in Florida is 65 mph unless otherwise posted. Speed limits are 70 mph on some rural interstate highways. Never assume that just because the area appears to be rural, the limit is 70 mph. Speed limits may change on other multi-lane highways.
60
The minimum speed on major routes (if any) varies by state. As an example, in many jurisdictions the minimum speed on a 65 MPH Interstate is 45MPH. Most states have a catch-all rule that states you can be ticketed for driving at any speed that is so slow as to impede the flow of traffic.
69
wrong.
70 mph - unless otherwise posted.
It varies by state. In North Carolina, the max is 55 miles per hour on a secondary road. In Texas, some rural secondary roads allow up to 70 miles per hour. Which state did you have in mind?