Preventing Unwanted Bodily Contact:
Coloured Hats Are The Answer
When I was at college I inadvertently broke the nose of an Asian girl by squashing her against a wall by shutting a door on her, I was studying sociology at the time and thought it would be a good idea to find out why.
I found that the darker your skin is, and the smaller you are, the harder you are to see and the longer it takes to focus on you. Many people who have dark skin and are small complain that they are often being bumped.
My findings were that to get over this unwanted physical contact that the darker your skin was, or the smaller you were the lighter the hat that should be warn in order to be seen in time. Yellow and orange are ideal suggestions.