What's the speed limit? States with the fastest and slowest speeds

If you're driving between states this holiday season, watch out for speed limits different than you're used to.
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Are speed limits on the rise? As states OK 80 mph on highways, cities say '20 is plenty'

Observant motorists may notice a curious trend on U.S. roads: Driving on highways is getting faster while city speeds are getting slower. In denser, more residential areas, an increasing number of ...