checkpoint
barricade
barrier
boundary
building
check
closed
construction
crossing
danger
design
entrance
entry
fence
forbidden
gate
guard
highway
hurdle
illustration
industrial
industry
maintenance
object
obstacle
parking
patience
protection
railroad
restricted
road
roadblock
roadsign
roadwork
safety
secure
security
sign
stop
street
stripe
striped
traffic
transport
waiting
warning
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