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Road signs in the United States - Wikipedia
Manual of Traffic Signs
American Highways 101: Visual Guide to U.S. Road Sign Designs ...
Road Signs and Meanings (US Traffic Signs List) - DMV Practice Test
US Road Signs: Traffic Sign Encyclopedia - Driving-Tests.org
U.S. Route shield - Wikipedia
Road Signs & Traffic Signs in the US: The Definitive Guide
Standard Highway Signs (SHS)—PDF and EPS files for New and …
Manual on Uniform Traffic Control Devices (MUTCD) - FHWA
Shields and Signs | FHWA - Federal Highway Administration