access
appliance
arm
auto
automatic
automation
automotive
barricade
barrier
beware
boundary
camera
caution
cctv
check
closed
control
driveway
electric
enter
entrance
entry
equipment
exit
forbidden
gate
gateway
guard
place
post
private
protect
residential
restricted
rising
safety
security
security system
sensor
signal
space
stop
symbol
system
transportation
warning
way
wireless
zone