Here’s the press release from Metro:

The I-405 Sepulveda Pass Improvements Project contractor is planning to close the northbound I-405 in the Sepulveda Pass for four consecutive nights April 24-28.  The closure boundaries and hours change each night. The closures will enable the contractor to install overhead freeway signs.

• The northbound I-405 will be fully closed from Getty Center Drive to Greenleaf Street on the night of Thursday, April 24, midnight to 5 a.m., Friday, April 25

Closures:

• Ramps begin closing as early as 7 p.m. Lanes begin closing at 10 p.m. 
• Northbound Sunset Boulevard to on-ramp  
• Northbound Moraga on- and off-ramps 
• Northbound Getty Center Dr on-ramp
• Northbound Skirball Center Dr on-ramp
• Northbound I-405 to the north US 101 connector

Detour:

From I-405 northbound: Take the northbound Getty Center Drive off-ramp, head north on Sepulveda Boulevard to the northbound I-405 on-ramp at Greenleaf.

• Northbound I-405 fully closed from Skirball Center Drive to Greenleaf Street on:
  • Night of Friday, April 25, 1 a.m. to 6 a.m., Saturday, April 26
  • Night of Saturday, April 26, 2 a.m. to 7 a.m., Sunday, April 27
  • Night of Sunday, April 27, midnight to 5 a.m., Monday, April 28

Closures:

• Ramps begin closing as early as 7 p.m. Lanes begin closing at 10 p.m.
• Northbound Skirball Center Dr on-ramp
• Northbound I-405 to the north US 101 connector

Detour:

From I-405 northbound: Take the northbound Skirball Center Drive off-ramp, head south on Skirball Center Drive, head north on Sepulveda Boulevard to the northbound I-405 on-ramp at Greenleaf.

What to expect:

• Work is dependent on favorable weather conditions.
• Emergency access will be maintained at all times.
• For a listing of daily closures and latest updates visit our website atwww.metro.net/405 or follow us on twitter: www.twitter.com/I_405 and Facebook atwww.facebook.com/405project.