Nagata et al used different categories to describe different levels of slipperiness of a surface. The authors are from INAX Corporation in Japan.
Parameters:
(1) human perception of slipperiness
(2) perception of safety
|
Slipperiness
|
Safety
|
Category
|
|
very non-slippery
|
very safe
|
+3
|
|
non-slippery
|
safe
|
+2
|
|
slightly non-slippery
|
slightly safe
|
+1
|
|
neutral
|
neutral
|
0
|
|
slightly slippery
|
slightly dangerous
|
-1
|
|
slippery
|
dangerous
|
-2
|
|
very slippery
|
very dangerous
|
-3
|
