Reader Question: When Should Old Exit Number Signs Come Down?

“I have been traveling I-80 for about 20 years and, in Pennsylvania, they renumbered their exits quite some time ago to align with the road mileage — probably more than 20 years ago. They still have road signs that say ‘Old Exit 50’, but I doubt anyone is using a map that still references these old exit numbers. Is there some kind of law–state or federal–that requires interstates to keep the Old Exit Number reminder signs up there for a certain period of time? I feel like it’s time for those to come down, at least in Pennsylvania. Thanks!”

That intriguing question — at least, intriguing to me, anyway — was asked by…

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