ahead
alert
arrow
asphalt
background
bend
black
blue
car
caution
curve
curvy
danger
dangerous
direction
drive
green
hazard
hazardous
highway
indicator
information
landscape
left
message
metal
nature
outdoor
outdoors
outside
red
road
roadsign
safety
sharp
sign
sky
slow
street
symbol
traffic
transport
transportation
travel
trip
turn
warning
way
white
yellow