IMO due to the drivers inexperience behind the wheel. This is why I advocate for better instruction in driver's ed, of course this is an educated guess. The driver may be very experienced & this was a mistake he made, that could happen to anyone. If he is not as expereinced as he should be because drivers ed. did not teach him everthing he should know about driving then that means there is not enough education in the course. If it is the same as when I went through it 16 or 17 years ago enough is not taught to teach kids everything they should know before letting them drive. Then all they seemed interested in doing is getting us through the course as fast as they could, taught us the basics & turned us loose. They did not teach us how to react or behave around motorcycles or bicycles, or runners who run against traffic.
Here is the article: http://www.bikeiowa.com/asp/hotnews/...sp?NewsID=1684