access
alert
allowed
attention
background
ban
caution
circle
danger
disallowed
flat
forbidden
geometric
hazard
illegal
illustration
limit
line
man
mark
negative
no
object
pattern
pedestrian
prohibited
prohibition
red
repeat
repeating
restricted
restriction
roadsign
safety
sign
stop
street
symbol
texture
traffic
transportation
walk
walker
wallpaper
warning