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Figure 2D-3 Long Description - MUTCD 2009 Edition - FHWA
Sign Crew Field Book: Guide Sign Components
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NYSDOT en Twitter: "Do you know what these different highway signs mean? #NowYouKnow https://t.co/sGJsOOK3x3" / Twitter
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Sign of the times as highway exits are given new, confusing numbers
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