Topics: Ask an American: Commuting; start versus begin versus start off versus start on; a place to live versus a place to live in; might-have-been

Words:
congestion
central
public transportation
to switch over to
gradually
rush hour
peak
in excess
air pollution
fuel
emissions
pollutant
air quality
to start
to begin
to start off
to start on
a place to live (in)
might-have-been