adjustment
advice
alert
attention
border
cartoon
caustic
caution
derisive
deterrent
detour
direction
exhortation
forewarning
guide
highway
illegal
illustration
information
injunction
ironic
message
nonsense
octagonal
reality
red
ridicule
road
routing
sarcastic
satirical
sign
signal
snide
speed
street
traffic
warning
white
words