The overtaking study was done by Ian Walker five years ago:
http://www.bath.ac.uk/news/articles/releases/overtaking110906.html
Personally, I wasn't convinced by the study at the time, but I can't remember why, would have to read up on it again.
This is something that's currently going on, again involving Ian Walker:
http://road.cc/content/news/37646-new-helmet-study-group-receives-european-funding
@Oliver Schick started
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The overtaking study was done by Ian Walker five years ago:
http://www.bath.ac.uk/news/articles/releases/overtaking110906.html
Personally, I wasn't convinced by the study at the time, but I can't remember why, would have to read up on it again.
This is something that's currently going on, again involving Ian Walker:
http://road.cc/content/news/37646-new-helmet-study-group-receives-european-funding