access
banned
barrier
boundary
building
business
caution
commercial
concept
danger
design
disallowed
display
door
emergency
empty
entry
exit
forbidden
forest
garage
garden
gates
green
house
landscape
metal
office
outdoor
park
permitted
prohibited
protect
protection
protective
residential
restricted
retro
safety
secure
security
sign
steel
stop
symbol
transport
transportation
travel
tree
warning