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M1-1 Interstate Route Sign
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NYSDOT on Twitter: "Do you know what type of road you're driving on? The details on route designation signs let you know if it's a county, state, U.S. or interstate route. https://t.co/uql39mHNdQ" /
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American Highways 101: Visual Guide to U.S. Road Sign Designs & Numbering Systems - 99% Invisible
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American Highways 101: Visual Guide to U.S. Road Sign Designs & Numbering Systems - 99% Invisible
What's the Secret Behind the Numbers on the Interstate Signs? | HowStuffWorks
Figure 2D-3. Route Signs
