This afternoon I was riding home from Squamish, and I was in the left lane behind a mini-van, just past Lions Bay. We were passing a car in the right lane, as we went past the mini van put his right signal on, but hesitated for a couple seconds, I guess he was making sure it was clear, I don't know. The road was curving right and I think he was focused on his lane change, and ended up drifting left into the concrete barrier at ~90kph. He bounced off, was up on the left two wheels, coming close to tipping over. He managed to recover without hitting anyone else, and kept driving.
About 30 seconds later, he put his flashers on and moved over to the shoulder, and I could see that his left front tire was flat, and looked like the wheel was damaged too.
I thought of stopping, but there was a lot of traffic behind me, and it didn't feel safe to do so - he was already causing an obstruction as the shoulder is only a couple feet wide at that point. There was enough traffic behind me, i'm sure there was lots of assistance available. So I kept going. However I've been feeling guilty for not stopping. My pillion says he was an older guy and looked very shaken up, his wife appeared very upset as well.
I know you have a legal obligation to stay at the scene of an accident, but what constitutes being *in* an accident? I was not hit, however, I feel like he was only making the lane change because I was behind him. Was I part of the accident? Or was this just a case of someone's momentary lapse in attention, and no-one else to blame?