On my commuting route there's a section where I've had to avoid odd debris several times. I say "odd" because I'm still not completely convinced that it's intentional. The first time was small nails in the road (on the right where cars aren't generally driving). Those were cleaned up eventually, and I figured they had just fallen out of someone's truck. Second time, same general location--nails again. That time I got suspicious because it seemed unlikely that the same thing would be spilled in the same place. Third time was this past weekend when I had to swerve to avoid a bunch of razor blades in the road. They were actually pretty harmless since they were all flat on the road--I probably could have ridden over them with no problem. But still, who loses a box of razor blades out of their car or truck? The razor blades were about a mile beyond where the nails were before. But I don't see why someone with a vendetta against cyclists would choose that road to target--I see other cyclists on it from time to time, but it's not heavily traveled by cyclists, and I don't know of any group rides that use that road.

Sarah