Doesn’t have to be a beltway for the designation
FWICS. Merely a connector.
The I-495 designation was part of the New Jersey connector road to the Lincoln Tunnel for many years. This was supposed to have been directly connected to the
LIE by the
Mid-Manhattan Expressway, which Nelson Rockefeller ended up effectively killing—NYC is so much the worse for it too, and 42
nd Street is an eternal mess thanks to that.
According to the wiki page it should have had a odd number pre-fix which is what I thought. I reading wiki on interstate highway designations I saw that a 2 mile connector road in Falmouth Maine to the Maine Turnpike is designated as 495 (unsigned). It also does not follow the protocol, but since I-295 goes under it they numbered something else. The only people in Maine that know it is 495 are the traffic engineers.