Formula 1's US Grand Prix debut (November 2012)
Austin's first Formula 1 race at Circuit of the Americas drew huge crowds. Heavy traffic left some fans stuck on roads near the track, some missing the start.
Traffic complaints dominated post-race coverage; track operators and local agencies later built out parking and shuttle plans.
F1 became an annual October event that draws hundreds of thousands of visitors over the weekend, reshaping how Austin plans fall events.
Explains why one F1 weekend now sits alongside festivals like Viva La Vida, creating the traffic crunch behind this weekend's closures.
