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Category:Interstate 4 shields - Wikimedia Commons
Interstate 4 - Wikipedia
U.S. Route shield - Wikipedia
Interstate 4 - Interstate-Guide - AARoads
Highway shield - Wikipedia
Interstate 4 - AARoads - Florida
AARoads Shield Gallery
Interstate 4 West - Plant City to Mango - AARoads - Florida
What is the Interstate Route Marker or Interstate Shield?
Shields and Signs | FHWA - Federal Highway Administration