There was a study published a couple of months ago which looked at how cyclists’ appearance affected how closely drivers overtook them.
Available, at a price, here
Here’s the abstract:
Title: The influence of a bicycle commuter’s appearance on drivers’ overtaking proximities
Organisation: University of Bath
Date uploaded: 13th January 2014
Date published/launched: November 2013
This study looked at whether drivers overtaking a bicyclist changed the proximities of their passes in response to the level of experience and skill signalled by the bicyclist’s appearance.
This study looked at whether drivers overtaking a bicyclist changed the proximities of their passes in response to the level of experience and skill signalled by the bicyclist’s appearance.
Five outfits were tested, ranging from a stereotypical sport rider’s outfit, portraying high experience and skill, to a vest with ‘novice cyclist’ printed on the back, portraying low experience.
A high-visibility bicycling jacket was also used, as were two commercially available safety vests, one featuring a prominent mention of the word ‘police’ and a warning that the rider was video-recording their journey, and one modelled after a police officer’s jacket but with a letter changed so it read ‘POLITE’.
An ultrasonic distance sensor recorded the space left by vehicles passing the bicyclist on a regular commuting route. 5,690 data points fulfilled the criteria for the study and were included in the analyses. The only outfit associated with a significant change in mean passing proximities was the police/video-recording jacket. Contrary to predictions, drivers treated the sports outfit and the ‘novice cyclist’ outfit equivalently, suggesting they do not adjust overtaking proximity as a function of a rider’s perceived experience.
Notably, whilst some outfits seemed to discourage motorists from passing within 1 metre of the rider, approximately 1-2% of overtakes came within 50 cm no matter what outfit was worn. This suggests there is little riders can do, by altering their appearance, to prevent the very closest overtakes; it is suggested that infrastructural, educational or legal measures are more promising for preventing drivers from passing extremely close to bicyclists.
For more information contact:
Ian Walker, Bath University
T: 01225 383908
An interesting quote from the discussion in this article:
But it is striking that driver behaviour to POLICE was so different to POLITE given
the key word differed by just one letter. Not only was passing much closer on average with
POLITE, but subjectively the experimenter reported feeling much more at risk, and encountered
overt acts of aggression from several drivers, when wearing POLITE.