I believe the maximum speed limit is 55 MPH. I haven't been there in several years, so it may have changed since then.
about 9.3 mph
45
There are several Interstate Highways with a 75 MPH speed limit at various points throughout their span, but there isn't one which has that speed limit at every single point.
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.
"Double-nickel" refers to the speed limit of 55 mph that was mandated across the US in 1974 due to the oil crisis. This speed limit was intended to conserve fuel and promote road safety.
1
55 mph
70 mi. per hr.
1
No. Currently the fastest speed in the US is 85 mph (the first to open at that speed is SH-130 between San Antonio, TX and Austin, TX).
On public highways in Texas, they are considering raising it to 80mph.
35-65 MPH on most highways in the US