Of the cars that slipped onto the property, all of them did so “inadvertently,” according to a convention and visitors authority spokesperson. Their drivers followed the Boring Company’s vehicles “believing they were accessing a ride-share pickup spot or entry to parking, and were immediately directed out.” Only one such incident “resulted in a tunnel intrusion,” the spokesperson said.
In defense of the Loop, there really isn’t a way for a driver to “inadvertently” get into the tunnel unless they were completely clueless. From my personal familiarity with the system, vehicles can only access the tunnels from above ground at two stations: the west station and the south station. The west station sits at a part of the convention center that can’t easily be accessed by outside vehicles, as it literally shares an area with a loading dock. A fence with a closing gate and signs that say “Authorized Vehicles Only” and “Do Not Enter” are posted.