英文關鍵字
accident
asphalt
automobile
avenue
based
beach
big
brother
camera
car
city
control
crossing
detection
dioxide
drive
driving
early
electronic
electronics
empty
enforcement
equipment
evidence
guard
guidance
hour
insurance
intelligent
intersection
law
light
limit
monitoring
motorway
outdoor
police
radar
red
road
safety
signals
sky
speed
spying
stoplight
surveillance
tech
technology
traffic
watching