checkpoint
access
automatic
barricade
barrier
block
booth
border
boundary
bridge
car
check
closed
construction
control
design
entrance
entry
exit
fence
gate
icon
illustration
isolated
line
logo
object
obstacle
parking
plaza
protection
railroad
road
roadblock
safety
security
set
sign
stop
street
striped
symbol
system
toll
traffic
transport
transportation
vehicle
warning