"His study followed previous research that found many drivers saw cyclists as a group of "lycra-clad street-warriors.."
"This may lead drivers to believe cyclists with helmets are more serious, experienced and predictable than those without," he said in a statement released on Tuesday.
Walker found drivers passed an average of 3.3 inches (8.5 cm) closer to cyclists with a helmet than without, giving cyclists the room needed to avoid drain covers and potholes.
As part of his experiment, Walker also donned a blond wig and found drivers gave him an average of 5.5 inches more space when they passed what appeared to be a female cyclist."
http://news.yahoo.com/s/nm/20060913/sc_nm/bikes_dc