I imagine this is the plan because LA already has limited parking. The influx of Olympic goer drivers and local residents during the Olympics would be... 
They'd probably have to build parking garages to accommodate for attendees for a few weeks and even with that people would still probably need to shuttle over to the venues depending on where they threw the garages up.

They'd probably have to build parking garages to accommodate for attendees for a few weeks and even with that people would still probably need to shuttle over to the venues depending on where they threw the garages up.