architecture
area
background
ban
break
brick
care
construction
crash
danger
depression
discouraged
do
door
figure
glass
headache
helmet
industrial
label
ladder
lean
leaning
leisure
material
no
not
obstruct
person
prohibited
public
restricted
risk
rule
safety
security
service
sign
site
slide
step
sticker
stop
stress
surface
symbol
transportation
walk
wall
way