英文關鍵字
afternoon
asia
automobiles
autotoll
barrier
bottleneck
bridge
cabin
car
cars
china
city
congestion
cost
day
drive
drivers
driving
emissions
expense
fare
fast
fee
freeway
fumes
gate
gridlock
highway
lane
lorry
pay
payment
pollution
road
tax
toll
traffic
transportation
truck
tunnel
urban
vehicles