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In this photo, glass nuggets covered about 100ft/33m of the bike lane on Cornwallis Rd eastbound near NC 147 in the RTP, fresh carrion from a nasty wreck no doubt. I was lucky that I saw the mess in my headlight during my dark morning commute. (As I was sweeping, a lady actually stopped and asked if I was okay. Most motorists are nice.)
Clean your route. The tire you save may be your own.