Cyclist fails to yield changing lanes - didn't negotiate to change lanes. Motorist turns left - first most common motorist caused collision, see below. Cycling on sidewalk - a common cause of children injury and death. Children don't understand that every driveway is an intersection and how to approach them cautiously. Motorist turns left - motorist travelling in opposite direction collides in intersection.
Motorist turns right - motorist passes cyclist and turns right in intersection.
Motorist restarts - motorist stops at side road, restarts and collides in intersection. Failing to yield the Right of Way - aggressive cycling. Riding on the wrong side - still a contentious issue with people who were taught to walk on the other side of the road so motorists can see them. Wrong way cyclists usually insist they were doing the right thing and don't understand why other road users find their actions unpredictable. Ignoring Traffic control Device - stupid cycling.