Monroe County uses reference markers on its county highways, similar in appearance to those used by NYSDOT on state highways. However, Monroe County uses them differently, placing them only at the start of a bridge or culvert, in each direction of travel. At first they were placed only at county-maintained structures (and only on the northbound or eastbound sides); more recently they have been posted on overpasses crossing railroads, state highways and the State Barge Canal.
The markers use a three-line legend, like NYSDOT's, but the meaning
is different. The top line is a two-digit number indicating the Town. The
numbers are assigned alphabetically, with the City of Rochester following
as "Town" number 20. The list is as follows:
01 - Brighton
02 - Chili
03 - Clarkson
04 - Gates
05 - Greece
06 - Hamlin
07 - Henrietta
08 - Irondequoit
09 - Mendon
10 - Ogden
11 - Parma
12 - Penfield
13 - Perinton
14 - Pittsford
15 - Riga
16 - Rush
17 - Sweden
18 - Webster
19 - Wheatland
20 - Rochester
The Town/Village of East Rochester is not included; instead, routes therein are marked as though they lie in either Pittsford or Perinton, as was the case before East Rochester gained its autonomous status. (In fact, markers do not seem to have been placed yet on any county roads in East Rochester.)
The second line of digits is the route number. In addition to the linear routes shown in the table, there is a number of 555, which is used on county-maintained bridges along non-county roads. An example is on O'Connor Road in Perinton, on the bridge over Thomas Creek. Besides these, there are markers for "route" 777 at the start of the elevated section of the county airport terminal access road, and on the NY 204 overpass. It is assumed that this number applies to the entire system of airport access roads. (Markers with "666" in the second line have not been found; it is likely they were intentionally passed over to avoid unforseen problems.) Finally, the number 000 is used for the Irondequoit Bay Outlet Bridge.
The third line gives the distance, in hundredths of a mile, from the route's beginning or from the town line. Distances are reckoned in the usual fashion; i.e., beginning at the south or west end of the route.
These markers began appearing in 1998 or so, and have now been placed on very
nearly all county highways.
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