A New Beginning and New End Signs

The 1992 "Route 66 Law" or "U.S. Route 66 Designation Act" designated the existing portion of Route 66 in Illinois as a State historic highway. In consequence the former US 66 was marked with the typical brown signs across the state of Illinois, signs that include those at its Eastern Terminus, the road effectively got a new "start".

Info taken from www theroute-66.com