Inspired by these two threads:http://www.aaroads.com/forum/index.php?topic=5523.25http://www.aaroads.com/forum/index.php?topic=6143.0
Basically, the opposite of Maryland's I-595: routes that are signed Interstates with little indication otherwise, BUT may not be in FHWA route definitions - regardless of local usage, full signage with the red/white/blue shield, etc. (Wanted to put this in its own topic as opposed to hidden in the first link)
The examples I've seen so far:
- Interstate 80 in San Francisco between US 101 and the Bay Bridge, which was officially part of the route from 1956 to 1968, but which was removed then with the FHWA definition changing to start at the then-existing I-480 interchange (now the west landing of the Bay Bridge). I've always wondered if this was a clerical error of some sort in trying to remove the cancelled Western Freeway from the books, or an intentional milage decision in order to add a few more miles to the 1968-era I-105 (today's Century Freeway) which garnered much of its allotted miles from cancelled routes.
This road has always been signed as I-80 in both directions since the Interstate era began, although much of it was constructed as US 40 and US 50 prior to the Interstate system's existence.
- Interstate 110 on the Harbor Freeway in Los Angeles between the Four-Level Interchange/US 101 and the Santa Monica Freeway/I-10.
This one is a special case, dating back to the early-80s signage of the Harbor Freeway as an interstate. South of I-10, both directions are given I-110 signs, and this is indisputable.
North of I-10, on the one section that allows trucks before the Arroyo Seco Parkway begins, it's murkier:
except for one or two stray 1980s signs along a collector/distributor setup, all reassurance markers on the large green signs are for I-110, some dating back to the button-copy era (not sure when though) and some of the retroreflective variety.
Both the old, now-replaced button copy and the current retroreflective signage for the ramps from 101 (both directions) to 110 south list it as I-110.
Northbound on the Harbor Freeway, the signage is almost exclusively for State Route 110 however.
- I-495 between the Lincoln Tunnel and I-678 in New York City, as mentioned in the second link above.
- I-676 along the Ben Franklin Bridge, as noted in the first linked thread
- I-695 in southeastern Baltimore, and the south segment of I-895 between I-695 and I-95
Any other examples of this odd phenomenon?