英文關鍵字
bottleneck
bumper
busy
california
car
city
commuter
congestion
crawl
crowded
day
drive
driving
energy
environment
flowing
freeway
full
fumes
gasoline
highway
hour
jam
lane
life
motion
people
pollution
population
road
row
rush
slow
slowdown
speed
stopped
street
stress
sunlight
sunset
traffic
transit
transport
transportation
urban
usa
vehicles