Yellow markers show bridges that eligible for the National Register of Historic Places, while Green Markers show those on the National Register of Historic Places.
Data Source: National Bridge Inventory. https://www.fhwa.dot.gov/bridge/nbi/ascii.cfm
A cable barrier, sometimes referred to as guard cable or wire rope safety barrier (WRSB), is a type of roadside or median safety traffic barrier/guard rail. It consists of steel wire ropes mounted on weak posts. As is the case with any roadside barrier, its primary purpose is to prevent a vehicle from leaving the traveled way and striking a fixed object or terrain feature that is less forgiving than itself.
New York is finally embracing mile based exit numbers. The Taconic Parkway now uses mile based exits, as does Interstate 890 in Schenectady (because there is an exit nearly every mile).
MUTC 2009 Edition required all states to use mile-based exits on roads built after that year, but they did not include a set year for changing over existing highways, although the draft document called for a deadline of 2019, but now that's just the preference. Compliance with MUTC is required for federal highway funding. Virtually all states outside of New England switched over to mile-based exits in 1970s and 1980s.
The moral of the story: Expect to see a lot of New York highways with changing exit numbers in coming years, and "Old Exit XXX" signs.
"US 66 (Route 66) was officially removed from the United States Highway System on June 27, 1985 after it was decided the route was no longer relevant and had been replaced by the Interstate Highway System. Portions of the road that passed through Illinois, Missouri, New Mexico, and Arizona have been designated a National Scenic Byway of the name “Historic Route 66”. It has begun to return to maps in this form. Some portions of the road in southern California have been redesignated “State Route 66” and others bear “Historic Route 66” signs and relevant historic information."