bottleneck
brakes
bumper
car
city
clock
congestion
crawl
crowded
dioxide
drive
energy
environment
freeway
fuel
full
fumes
gas
gasoline
headache
highway
hour
jam
large
life
lights
nightmare
people
pollution
population
power
pressure
road
slow
slowdown
speed
stopped
street
stress
time
toll booths
traffic
transit
transportation
travel
tunnel
urban
vehicles
waiting