With three states raising speed limits this year I decided to make a map of where America stands:
The map shows the highest speeds posted in the state; in the case of Texas I anticipated the posting of 80 MPH speed limits later this year.
The corresponding map for two lane roads is
States with some sort of rumbling about increases in recent years include Idaho (75 two lane), Kansas (75), Kentucky (60 two lane, 70 freeway), Oregon (70), Minnesota (60 two lane and 75 Interstate), and Wisconsin (75 freeway). All of these states have neighbors with higher speed limits.
I wanted to make a map for four lane roads but I don't think it would be very informative. In some states rural divided highways are almost entirely freeways; in others they are limited access without interchanges; in others they are not limited access.
States where I know there are non-freeway rural four lane roads with the maximum speed limit on such roads between two lane freeway limits are Alabama (65 on four lane roads), Florida (65 on divided highways), Indiana (60 on divided highways without access control), Missouri (65 on divided highways without access control), North Dakota (70 on divided highways), South Dakota (70 on divided highways), Washington (65 on divided highways), and West Virginia (65 on limited access corridor routes). Of the rest, some post expressways like freeways and others post expressways like two lane roads. --
