10
abstract
aluminium
aluminum
attached
border
bumper
colours
concrete
crash
curve
disaster
dividing
drive
end
energy
guard
guide
high
highway
information
interstate
isolated
lane
phone
place
plastic
prevent
protection
reflective
roadside
roadway
safe
safety
side
signs
solid
sos
space
speed
steel
sturdy
threedimensional
traffic
transportation
vehicle
way
white
wide
zone