access
allowed
ban
banned
beyond
caution
closed
danger
dont
entrance
exclusion
forbid
forbidden
gray
halt
human
law
legal
man
mandatory
negation
negative
no
not
notice
order
people
person
personal
persons
prohibit
prohibited
prohibition
protection
red
refuse
regulations
restrict
restricted
rule
rules
safety
sign
stop
symbol
unauthorised
unauthorized
wall
warning