alert
attention
background
barricade
beware
bump
caution
choice
control
damage
danger
direction
hazard
highway
icon
information
mark
notice
obstacle
outdoor
parking
plastic
point
purchase
red
risk
road
safety
security
set
sharp
shop
sign
signal
spike
stop
street
symbol
thorn
tire
traffic
transport
transportation
triangle
warehouse
warning
way
wheel
white