Originally Posted by TMonk

Crazy ride last night.

I did a local shop ride last night to be social, and do something different. It was just a few of us; the leader (a shop employee) and some college kid were pretty fast, so it was fun.

Toward the end we are coming down Kearny Villa, a flat, fast, long and open road with a tailwind. Three of us are pacelining at ~30mph. While I'm on the front, taking a slightly extended pull, we come up on some big rocks in the bike lane, like softball-sized. By the time I had noticed them, I was already going through, fortunately I didn't hit any. Other two are tight on my wheel.

The third rider (shop employee, ride leader) hit one and went down. After a couple min. of laying down and calming down a bit, it was clear he had a broken collarbone - swelling, redness, and a clear protrusion from a displaced bone. Fortunately there wasn't significant damage to his bike or his body otherwise.

I feel kinda bad that I didn't notice them sooner, but sometimes they (road obstacles) just come up on ya. The whole time we had been pointing out obstacles and riding courteously. I don't feel personally responsible or guilty at all, just bad for the guy