People are assholes, people in the states only care about themselfs and not the environment, so they will throw shit on the ground or out their car no matter how dangerous it is.

It feels like that sometimes.

In some places there is a lot of hate towards cyclists, so it’s very possible. But it could also be smashed car windows. (Although I believe that should be “security glass” and should not be extremely sharp… I might be wrong)

Unfortunately though, there are many examples I’ve seen and lived through myself. Glass, nails, metal wires across the bike path … I’ve seen it all.

I used to live in Cork (Ireland) and the hostility from drivers towards cyclists is next to deadly. I’ve been purposefully cut off many times in that city. And on Friday morning, after a so called “students night” the streets are littered with broken glass. Fun times.

broken glass strewn about.

If it looks like broken bottles, then it’s likely intentional (i.e. targeting cyclists). But as others have pointed it, it could also be smashed window glass, which will look considerably different to broken bottles.

Either way, it’s honestly a shame that criminals have to ruin it for everyone else.

Not that it’s going to prevent every puncture, but I’d consider getting some beefy, puncture resistant tires for your bike.

If there is street parking there too, it sounds like someone was smash and grabbing from the cars.