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American Highways 101: Visual Guide to U.S. Road Sign …
U.S. Route shield - Wikipedia
Road signs in the United States - Wikipedia
Highway shield - Wikipedia
U.S. Markers: National and Regional Highways
National Highway System - ArcGIS
Road signs in the United States - Simple English Wikipedia, the …
National Highway System Map - ArcGIS
Road Signs & Traffic Signs in the US: The Definitive Guide
Road Signs and Meanings (US Traffic Signs List) - DMV Practice Test