I presume the green icons represent bridges that are in decent shape (a helpful graphic should have a complete legend); the red ones, obviously, are not. Although the green icons, thankfully, outnumber the red ones, there's still a distressing number on red ones. Doesn’t fill a guy with a lot of confidence … especially since the red icon right next to the “pin” on the map is a bridge I use several times a week.
Amuse and/or frighten yourself by visiting http://t4america.org/resources/bridges/.
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