Post by Garrett WollmanAs of about fifteen years ago, the state maintains the route signs on
all state routes, whether or not any particular stretch is a state
highway. (There are also state highways that are not state routes.
Compare New York reference and touring routes.)
I searched the AASHTO site, and like all bureaucratic sites it's awfully
easy to find anything you don't want. So I was unable to find their rules
for U.S. Highways. I did, however, find a 1970 AASHTO document elsewhere
that, if still in effect, implies that AASHTO must have okayed the
withdrawal of the numbering. The fact that the guide signs were not merely
taken down, but replaced with Historic signs, suggests that some agency or
group wanted US-6 abolished in P'town, and another didn't.
http://www.trafficsign.us/uspolicy.html
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Ciao, Paul D. DeRocco
Paul mailto:***@ix.netcom.com