animal
aquatic
background
beware
black
blue
careful
caution
control
crossing
danger
dangerous
drive
duck
fowl
habitat
hazard
highway
icon
illustration
information
instruction
isolated
isolation
metal
metallic
post
red
reflective
regulation
road
roadside
roadsign
safe
safety
sign
signage
signpost
silhouette
slow
speed
street
traffic
transport
transportation
triangle
warn
warning
white
wildlife