mirror176
If it is as seen in https://www.bing.com/maps?cp=33.638707~-112.36809&lvl=17&dir=36.382&style=x&v=2&sV=1 then the Sun Village Parkway 'W' was for the numeric info for helping find the north/south running road along a numeric east/west grid. That road does later curve to a more east/west direction a little later north. If based off of something newer than the imagery I do not know. Your comment reminds me I wish I knew how to work with newer TIGER data than what is normally offered already prepared through JOSM/ID.