Along the way I found myself leisurely gazing over a highway bridge and when I looked up a jagged remnant of an alloy car wheel was lying in the right-side track of my lane. A gentle swerve took me clear and by the time I was able to stop, turn around, and get back to clear the lane, four other vehicles (including a motorcycle) had passed by the chunk of death and continued on their carefree way. This is a little disturbing, 'cause this thing would certainly take down a motorcycle or do some serious damage to a car. C'mon people, let's help each other out.
http://wisconsindot.gov/Pages/travel/road/rustic-roads/default.aspx