While there is a public perception that cyclists are usually the cause of accidents between cars and bikes, an analysis of Toronto police collision reports shows otherwise: The most common type of crash in this study involved a motorist entering an intersection and either failing to stop properly or proceeding before it was safe to do so. The second most common crash type involved a motorist overtaking unsafely. The third involved a motorist opening a door onto an oncoming cyclist. The study concluded that cyclists are the cause of less than 10 percent of bike-car accidents in this study.
I can find that pretty easy to believe, actually. In most cities—and certainly in Los Angeles—cars rule the road. So drivers are attuned to check against potential car-car accidents but don’t think as much about potential car-bike accidents. When you park your car on the street you might check your side-view mirror for cars before you open your door, but you’d be less likely to check your rear-view mirror for cyclists coming up behind you. Also, you just generally feel more exposed and focused on a bike than in a car, so you’re more careful.
What’s way more perplexing to me is this animosity between “cyclists” and “drivers” as if we don’t all do a little of both.

Posted to GOOD by Andrew Price
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Owen H. says:
This study has been criticized by most experts, including those in the bicycle community, for methodological failings. Most studies have found an approximately 50/50 split in responsibility for crashes between drivers and bicyclists.
If you're worried about getting in to bike crashes, take a traffic cycling course from a certified instructor. They're inexpensive and available in most major cities. Go to http://www.bikeleague.org/programs/education/course_schedule.php. Courses focus on how to avoid the most common crash types, lane choice and positioning, bike maintenance and cycling comfort.