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In most countries, on most roads, there is no minimum.
It's possible that it might have. Unfortunately, without knowing the specific turnpike, we may never know.
Do not exceed the speed limit is correct
40 mph
In normal Conditions, if the speed limit is 65, it is generally 50. If the speed limit is 55, then the minimum is 40. In Ky the minimum is 45 mph on any parkway or interstate.
No. You are also allowed to drive at speeds below the speed limit. Some highways will post a minimum speed in addition to the speed limit, with the requirement that you use four-way flashers if your speed drops below the posted minimum.
There is no minimum
Yes, many state highways have a minimum speed limit.
No, a speed limit sign typically indicates the maximum speed allowed on a particular road or highway. It does not specify a minimum speed. However, some jurisdictions may have specific laws or rules regarding minimum speeds on certain roads for safety reasons.
The purpose of minimum speed limit laws is to keep traffic flowing smoothly on freeways. A very slow vehicle on a freeway can cause a traffic bottleneck.
There is no established minimum, only a maximum speed. The minimum speed can be set by local municipalities and must be posted by signs.
Generally in the USA if you are on an Interstate ( 95,80 etc) the minimum speed is 40 by law, but by practice no less than 10 miles below the speed limit.