there are places where there is NO speed limit.
Jamaica
The highest speed limit on the Interstates is 75 MPH.
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.
70 m.p.h. I can't quote the chapter and verse of the law, but I live in Georgia (U.S.A.) and 70 is the highest speed limit I see on our highways.
The highest speed limit I know of on an Interstate highway in the U.S. is 75 MPH, but that varies.
Some of the western US states used to have no upper speed limits, but they no longer do. In order to accept Federal Highway Funds they had to come into compliance and establish upper limits to the speed allowed on their highways.
Alaska
The universal speed limit for material objects is c : the speed of light in a vacuum.
Yes, many state highways have a minimum speed limit.
India's highest speed limit is 180km/h or 120mph in the Bangalore's Airport expressway
A yellow diamond-shaped sign with a black number inside indicates the highest safe speed limit in that area.