Cars enter and exit O'Hare via I-190, which branches off I-90 (the Kennedy Expressway) leading to downtown Chicago.
Cars may also access the airport locally from Mannheim Road, the airport's eastern boundary. Aside from cargo access
on its south side, all airport traffic travels through the east side of the airport.
Trains from the Blue Line of the CTA's 'L' depart the terminal from an underground station. Commuter trains
from the Metra North Central Service at the O'Hare Transfer station, which is connected to
the Airport Transit System via a shuttle bus.
Access within the airport complex can be accomplished using O'Hare's Airport Transit System (ATS), a 2.5 mi (4 km)
long automated people mover system that operates 24 hours a day, connecting all four terminals and the remote parking