We don't use that sign/symbol in the US.highway, clearway, speedway, freeway, expressway? (AmE)
I have never heard "clearway" used here.
A "speedway" would be a track for the racing of cars, not a road for traveling.
A "highway" need not be a "limited access, divided" road ( i.e. no traffic lights, entry and exit only via exit ramps, maximum speed limits). Any "major" road, even if it has traffic lights can be a "highway."
Freeway and expressway would usually denote a limited access road. An "interstate" would be the same.
In some areas (like mine) the major interstates near the big city are called "parkways."
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