A few years ago I was in Luzern (=Lucerne), Switzerland; I noticed the aftermath of a minor traffic accident between two cars. After the two cars departed, there was some broken glass left in the street, the policeman on the scene, took out a broom and pan (from his trunk) and swept up the glass. I just can't see a NYC policeman sweeping up broken glass--it would remain in the roadway until the next time road sweepers came through.