[RogerC60]

While I think the real fault lies with her riding too close to the bike in front of her, and in not wearing a helmet, indirectly it was the grass clippings in the road that precipitated the whole incident.

I thought the same thing when I read about that incident. A child darting into the road, an oncoming motorist drifting across the center line, or any of a number of other hazards could have produced the same unfortunate result. We need to ride ready for the emergency that assuredly will happen in front of us one day.