A message sign on the southbound 5 freeway, north of Santa Clarita. Photo by Dave Sotero/Metro.

The closure of the 405 over the Sepulveda Pass will begin late Friday, July 15, and continue until early morning on Monday, July 18. Here’s the news release about the signs from Metro:

Sixty-four Changeable Message Signs (CMS) located on most Los Angeles County freeways began displaying information about the upcoming closure of the San Diego Freeway (I-405) over the weekend of July 16-17.

The closure is necessary to replace the Mulholland Bridge as part of the northbound I-405 HOV lane construction project between the Santa Monica Freeway (I-10) and the Ventura Freeway (U.S. 101). When completed, this project will create a continuous HOV lane in both directions of I-405 in Los Angeles County.

Northbound I-405 will be closed from the Santa Monica Freeway (I-10) to the Ventura Freeway (U.S. 101). Southbound I-405 will be closed from U.S. 101 to Getty Center Drive.

The CMS notices began appearing the evening of Friday, June 10 and will be in effect every weekend until two weeks before the closure; at that time, the message will be displayed around the clock.

More than 30 additional signs will be placed at freeway locations as the closure nears. Approximately 40 to 50 such signs also will be posted on various surface streets in Los Angeles County. Signs also are appearing on north/south routes around the state as far north as just below the Oregon State Line.

“Caltrans knows from past experience how effective CMS signs are in conveying information to the motoring public,” said District 7 Director Mike Miles. “We are spreading the word as far as possible to ensure that people know to stay away from the closure area and limit driving over the July 16-17 weekend.”

For more information and the latest updates on the I-405 Sepulveda Pass Improvements Project, visit www.metro.net/405 or follow the project on twitter: twitter.com/I_405 and Facebook at facebook.com/405project.