allow
blizzard
caution
cautionary
christmas
city
clear
cold
color
communication
control
crossing
danger
departure
driving
falling
freeze
frost
glow
go
green
highway
hoarfrost
ice
icy
intersection
light
nature
permission
red
road
row
safety
semaphore
sequence
sign
signal
snow
stop
street
traffic
trafficlights
transport
transportation
travel
tree
urban
warning
weather
winter