alert
arrow
black
blue
car
caution
clipping
constraints
danger
dangerous
do
dont
down
downhill
forbid
gear
grade
highway
info
information
isolated
law
left
mountain
no
path
placard
prohibit
right
road
roadside
roadsign
safety
sign
signal
sky
slope
steep
street
symbol
traffic
transport
transportation
travel
truck
turn
warning
way
white
yellow