access
attention
ban
concept
danger
design
direction
enter
entrance
entry
forbidden
gesture
graphic
hazard
highway
human
icon
illegal
illustration
indication
information
isolated
lane
law
mark
message
no
pictogram
prohibited
red
restrict
restriction
risk
road
round
rule
safety
security
sign
silhouette
stop
symbol
touch
traffic
transport
transportation
warning
white
wrong