英文關鍵字
asphalt
auto
automobile
avenue
breaker
bump
calming
car
cop
crosswalk
discomfort
drive
driver
egulation
hump
kipping
law
lying
metal
motor
parking
path
plastic
police
policeman
problem
ramp
reduce
road
route
rubber
rule
safety
sign
sleeping
slow
speed
stop
surface
traffic
transport
warning
way
wheel