the posted speed limit
The speed limit is 55mph.
The normal speed limit on the highway.
55 on the highway, and 30 in the city.
It all depends on the type of highway and the speed limit signs.
Whatever the posted speed limit is.
kilometers
The Autobahn
In the US, the maximum speed on an interstate highway is 70. Until recently, there were a couple of stretches of highway that were limitless.
This question makes no sense, what do you mean? the speed of the car does not dictate the posted speed limit.
scalar
meter