ABSTRACT
Falls are the leading cause of occupational accidents in Japan [1].
Slips are the most frequent event leading to falling accidents [2-5].
Most accidents that involve slips and falls in a work place occur on
liquid-contaminated floor surfaces [6-8]. Floor surfaces are often
contaminated with water or oil in food factories and restaurant
kitchens, causing slips because of the formation of a fluid film
on the contact interface between the soles of shoes and the floor
surface. Therefore, a footwear outsole pattern is required that is very
resistant to slipping on floor surfaces covered with water or oil.