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How are distances listed on freeway signs between cities
American Highways 101: Visual Guide to U.S. Road Sign …
Highway location marker - Wikipedia
How Mile Markers Work - Interstate Signways
6 Vital Navigational Road Signs You Must Be Familiar With
Metric signs in the US – US Metric Association
The Origin of the US Highway Mile Marker - Interstate Signways
THE SECRETS BEHIND ROAD SIGNS - AAA Club Alliance
Mileage sign - Wikipedia
Interstate Signs: A Guide to Navigating America’s Highways