75 mph
Posted speed limits tell you what the maximum speed is on that specific road. That is the speed that you are legally able to drive on the road.
The maximum speed limit in Florida is 55 mph, except where otherwise posted. Speed limits are 70 mph on some rural interstate highways.
"The maximum speed limit on the freeway is 70mph."
Parts of the German Autobahn do not have posted speed limits.
For safety.
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.
Roads are built for safety and speed limits are determined by the conditions of the road on which they are posted.
70
Germany has the Autobahn there is no speed limit on the Autobahn. It is Germany's version of a freeway.
The distance is ~475 miles. Allow 8 or 9 hours for the trip if running at posted speed limits.
The maximum speed limit.
Varies by jurisdiction. In Texas, these roads have speed limits of up to 75 MPH.