If you see a decimal point on a speed limit sign, there's a good reason why

The United States has some pretty strange road signs. These speed limit signs with decimal points serve a very practical ...
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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 ...