I had only fallen once with my bike as an adult. I live in Sweden and our cycling infrastructure in my town is g r e a t. The problem was that it was spring, so all the gravel/sand which had been spread during the winter was now on bare asphalt. I turned left and while the wheel turned, the bike did not.

There ain’t much good infrastructure can do about gravel on asphalt.

Thankfully I didn’t hit my head as it would’ve surely been a pretty bad accident. Instead I just hit every single boney part on my left side.