LOS ANGELES (AP) — Traffic in the Los Angeles area is so far moving smoothly, several hours after authorities shut down a 10-mile stretch of one of the nation's busiest freeways for a massive 53-hour construction project.

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Ramps to the normally clogged Interstate 405 began shutting down Friday evening before the entire roadway was closed at midnight. Crews are removing the 50-year-old Mulholland Bridge as part of a $1 billion widening project.

Saturday morning, demolition work was proceeding on schedule.

KNX radio reports that most drivers have been cooperating with calls to stay away from the area around the 405. No traffic jams have been reported, although motorists are experiencing minor delays in some areas.

Weekend traffic is expected to reach its peak Saturday afternoon.