英文關鍵字
road
barrier
ramp
bump
car
traffic
asphalt
transportation
jump
street
obstacle
rubber
sleeping
speed
stop
hump
yellow
protection
urban
vehicle
warning
control
reduce
striped
surface
safety
bumpy
outdoors
sign
path
bulk
slow
cushioning
symbol
pass
wheel
damper
roadway
accident
automobile
diminishing
rule
drive
transport