How long is US highway 20, really?

US 20 is the longest highway in the country.  In late 2016, officials from both endpoints (Oregon and Massachusetts) posted twin signs, one at each terminus of the highway (photos and more info on the US 20 page).  While that was a really great idea, it is unfortunate that the distance listed on those signs (3365 miles) is off by a non-trivial amount.

Wayne Brunelle, Nov. 2016

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