Two days ago I got the worst tire slash I've ever had. I was on a great local ride when I came upon a whole lot of broken pieces of something spreading from my bike lane to across the road. It looked like broken crockery. I had been going pretty fast so I tried to maneuver myself through it. But, alas, a loud pop told me that I had failed. When I checked my rear tire, I saw it was gashed from the middle of the sidewall to the middle of the tread. The road hazard was some kind of opaque glass. There was just no way that that tire could be repaired, even to get home. I walked to the nearest phone and had to call home to get picked up.
Fortunately, that Conti GP 3000 only had a month or two of tread left on it and I had prepared for its demise by buying a replacement about a month ago. As soon as I got home, the first thing I did (even before I took my bike off the rack) was to call the county road department and report the hazard. They said that they would clean it up ASAP. A couple of hours later, I had to go by that spot in my car, and it was cleaned up.
Rich