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Feb 1, 2013 at 23:29 comment added yo' I do not have any statistics on either of these two points. I can only add my experience from two large cities: In Prague, I always wear a helmet, because the drivers are very aggressive whatever you do (and their behaviour doesn't really change). In Paris, I do not wear a helmet, because my experience and experience of others is that drivers treat you much more badly when you wear a helmet. My conclusion is that answer to this question depends a lot on where you ride your bike and what are the local habits there.
Jun 1, 2011 at 22:19 comment added freiheit The wind of the vehicle can also throw you off balance, the car may not be considering their mirror or other above-wheel protrusions in their width estimate, and the car may be overestimating how straight a line the cyclist is riding in. There's a basic human startle reflex that makes keeping a straight line difficult when several tons of steel rush by at 50 miles an hour inches away.
Jun 1, 2011 at 16:07 comment added Lagerbaer The annoyance and disturbance has the potential to throw you off balance.
Jun 1, 2011 at 14:43 history edited Rabskatran CC BY-SA 3.0
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May 28, 2011 at 15:19 comment added user unknown A vehicle which passes close doesn't hit the cyclist, but passes - by definition. Closely passing cars might be annoying and disturbing, but I can't see how they should be a risk. Most car drivers fear about the proper surface of their car, and aren't interested in accidents themselves - whether helmet-wearing biker or naked head.
May 28, 2011 at 6:16 comment added Wai Yip Tung On your second point, you can also argue the other way. People who wear helmet are more safety conscious and less incline to risky behavior.
May 28, 2011 at 6:12 comment added Wai Yip Tung I seriously question whether Ian Walker's result is reproducible. When I pass a cyclist in a car, I need to pay full attention to the road condition. I have zero impression on whether the cyclist wear a helmet or not, or what kind of bike they are riding. Let alone can I alter the pass distance. Someone setup a road side camera can probably verify his result.
May 27, 2011 at 16:02 comment added Martha F. Some references on passing distance with or without helmets: bhsi.org/walkerstudy.htm and sciencedirect.com/science/article/pii/S0001457506001540
May 27, 2011 at 15:42 comment added Rabskatran @Konrad : I will ask the friend that told be about this and add a link is available.
May 27, 2011 at 13:45 comment added user unknown @Rabskatran: You can also argue the opposite way (bullet 2): A helmet-wearing cyclist always gets conscious of the risks of cycling when pulling the helm on.
May 27, 2011 at 10:45 comment added Konrad Rudolph Your second point was mentioned by Lagerbaer as “risk homeostasis”. Your first point would be very interesting with a reference.
May 27, 2011 at 10:02 history answered Rabskatran CC BY-SA 3.0