I could've easily been changing lanes at full speed, had there been less traffic. Wonder what happens if you hit one of these straight on with a bike that has 4-5 inches of suspension travel.
I always stop and pick those up (when on 4 wheels). Post 'em up on kijiji.
Probably fell off a pickup truck or SUV. I drop the spare tire at least once a year to check pressure/condition and lube the wire and winch parts.