Some of the county routes in West Virginia are marked by very, very, very small route markers in addition to the traditional "road name/route number" signs. This seems to be very common in some of the northwestern counties (Putnam, Mason, Wood and Pleasants, to name four).
Got a few photos of some of them yesterday. Saw this one, but didn't get my own photo, today. Look below the arrow beneath the WV 892 marker to see a tiny CR 11 marker.
https://goo.gl/maps/H2sTN3yC94C2
Hawaii DOT usually adds small white route number plates under milemarkers, in addition to or instread of regular route markers, like this one (which unlike the example cited by H.B., doesn't resemble a miniature regular route marker):
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.hawaiihighways.com%2Froute83.jpg&hash=a3b32059a50221ab2544ee44373eefd0a1463ac1)
Marin County here in CA used to sign specific county roads with white paddles similar to Caltrans' county-by-county mileage markers. They used alphanumeric prefixes to denote the route classification ("A" for Arterial or "C" for Connector), but did not duplicate the numbers, which were mostly in the 100+ range. The paddles were found primarily in rural areas, but did turn up sporadically on urban arterials, such as Sir Francis Drake Boulevard -- which was "A101" from San Anselmo all the way out to CA 1 near Point Reyes Station (A101 also included the 3rd-4th street couplet in San Rafael) but was "A102" from San Quentin to San Anselmo. Even the dreaded Fairfax-Bolinas Road, with its weather-deteriorated pavement, got its own number (C105).
For a time, the US-65/69 concurrency between Des Moines and a point south of Indianola was mistakenly marked with mile markers that had both tiny US-65 and 69 markers above them (here's one seen in GSV from 2013) (https://goo.gl/maps/zbtLgmtkD1C2). The stretch of road is measured with US-65's miles, and they have since been corrected to only use tiny US-65 markers.
But for some reason, as of last October, this mile marker minus the mileage sign was still posted. The mile marker itself has been reposted and is a few hundred feet ahead, as can be seen in the background of the picture.
(https://i.imgur.com/TW0SRgul.jpg) (https://i.imgur.com/TW0SRgu.jpg)
There was this thread on route shields used on street blades: https://www.aaroads.com/forum/index.php?topic=17292.0
I'll have to dig it up but I have an 18x18 I-94 shield that came off the same BGS as my I-35 24x24 did. The really weird part is that it is just a straight up I-35 sign and not E or W. I seem to recall seeing 18x18 US Route signs now and then in Nevada, for sure older state route markers that somehow survived the numbering. I believe some are even present in the Shield Gallery for Nevada on this site.
I feel like Nebraska does this on I-80 for U.S. 30.
Quote from: TravelingBethelite on February 20, 2017, 08:26:39 AM
I feel like Nebraska does this on I-80 for U.S. 30.
You're probably seeing a 36x36 Interstate Shield on the same post as a 24x24 U.S. Route. That combo makes the smaller shield look pathetically small.
Quote from: Max Rockatansky on February 20, 2017, 09:46:47 AM
Quote from: TravelingBethelite on February 20, 2017, 08:26:39 AM
I feel like Nebraska does this on I-80 for U.S. 30.
You're probably seeing a 36x36 Interstate Shield on the same post as a 24x24 U.S. Route. That combo makes the smaller shield look pathetically small.
Iowa does this where US-6 overlaps I-80, except for a few that seem to be newer installations. It does look kind of ridiculous. (https://i.imgur.com/3kdilBb.jpg)
I'm surprised that nobody has yet mentioned PennDOT's small SR markers (https://www.google.com/maps/@39.9035955,-75.3042444,3a,75y,325.74h,75.39t/data=!3m6!1e1!3m4!1s1qP6c5P_z9O9A5sL4gq4EA!2e0!7i13312!8i6656!6m1!1e1)
Quote from: PHLBOS on February 20, 2017, 10:36:54 AM
I'm surprised that nobody has yet mentioned PennDOT's small SR markers (https://www.google.com/maps/@39.9035955,-75.3042444,3a,75y,325.74h,75.39t/data=!3m6!1e1!3m4!1s1qP6c5P_z9O9A5sL4gq4EA!2e0!7i13312!8i6656!6m1!1e1)
I assumed he wasn't looking for reference markers intended for an internal DOT audience–such as PennDOT's little white signs or NYSDOT's little green signs.
But if he was, that's about as small a route marker as you can find.
https://www.google.com/maps/@42.6007017,-71.3409975,3a,15.4y,181.85h,87.08t/data=!3m6!1e1!3m4!1symrUjNKygZhbT-NDwsa-EQ!2e0!7i13312!8i6656!6m1!1e1
Does this monstrosity in Chelmsford, MA count?