around 65m.p.h on the straightaways
60
75
scalar
70
Depends which state you're in. Texas has the highest Interstate speed limits, with some sections being allowed up to 80 MPH.
The normal speed limit on the highway.
69
The highest speed limit I know of on an Interstate highway in the U.S. is 75 MPH, but that varies.
That depends on which state and which type of road you had in mind. There'll be a major difference in speed limits between an Interstate Highway in Texas and an unmarked crown road in Delaware.
A scalar, since no direction is specified.
55, in the city, 65 or 70 outside of the city. (U.S.)
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.
85 Miles in Texas east of Austin Texas
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.