In article ,
Andrew Sarangan wrote:

These are shown on the LL enroute chart by little brown circles connected
by a line. The legend says "substitute route, see NOTAMs". There are
several originating from the DQO VOR near the Washington DC area, but there
could be others as well. I have never noticed these before. Any ideas what
they are?

They're repaving the airway. This is the detour around the construction
equipment.