access
accessibility
antiterrorism
asphalt
barricade
barrier
border
bump
bumpy
closed
crosswalk
danger
diagonal
driveway
empty
equipment
hump
impediment
jump
line
metal
no entry
obstacle
obstruction
outdoors
parking
prevention
protection
red
risk
road
road closed
roadblock
roadway
row
security
sign
speed
stop
street
striped
surface
traffic
transportation
urban
warning
zebra