How The Heck Did They Film That L.A. Freeway Dance Scene In ‘La La Land’?

They shut down the exit ramp connecting the 105 and the 110 for two days to film the scene: “Six months of planning, 30 dancers, 100 extras, and at least 60 cars later, the opening number from La La Land, ‘Another Day of Sun,’ is a triumphant masterpiece that has critics swooning and audiences immediately adding it to the canon of great production numbers from movie musicals.”