Our friends up at Bikescape posted an interesting video which illustrates how there can be confusion on roads that leads to cyclist injuries.
A quote from the article:
A woman gets hit (and nearly killed) by a truck making an illegal right turn onto a freeway ramp and San Francisco's cycling community mobilizes. Seventy people gathered last Friday for a rush hour protest demanding that the city re-engineer the intersection to make it safe for cyclists and pedestrians. Bikescape attends the demo at Market and Octavia and reports back with interviews and commentary.