Gridlock Alert: Major 405 Freeway Closures Through Sepulveda Pass Set to Begin Friday

LOS ANGELES — Southern California commuters are being urged to brace for significant delays as a series of major lane closures on the I-405 Freeway are scheduled to begin this Friday evening. The construction, centered in the notorious Sepulveda Pass, is expected to turn one of the nation’s busiest thoroughfares into a “traffic nightmare” throughout the weekend.

The “Sepulveda Squeeze”: What to Expect

Beginning Friday night, March 20, crews will initiate a series of lane reductions and ramp closures to facilitate essential infrastructure repairs and pavement improvements. The work is concentrated on the stretch of the San Diego Freeway that connects the San Fernando Valley to West Los Angeles—a geographical bottleneck that carries hundreds of thousands of vehicles daily.

Transportation officials have warned that while the freeway will not be entirely shut down, the reduction in capacity will likely lead to “Carmageddon-style” backups. The closures are expected to persist until early Monday morning, just in time for the rush hour commute.

Strategic Repairs and Infrastructure Goals

According to transit authorities, these weekend closures are necessary to address deteriorating road surfaces and to perform safety upgrades that cannot be completed during standard overnight windows. By consolidating the work into a single weekend, officials hope to avoid weeks of incremental nighttime delays, though the immediate impact on weekend travel will be severe.

“We understand the frustration this causes for Angelenos,” said a spokesperson for the regional transit department. “However, the Sepulveda Pass is a critical artery. These repairs are vital to ensuring the long-term safety and efficiency of the 405. We are asking the public to exercise patience and, if possible, avoid the area entirely.”

Recommended Detours and Travel Advice

For those who must travel between the Valley and the Westside this weekend, experts suggest several alternatives, though they warn that secondary roads will likely see a surge in volume:

• Sepulveda Boulevard: While the most direct alternative, it is expected to reach capacity quickly.
• Canyons: Routes such as Laurel Canyon, Beverly Glen, and Roscomare Road may offer alternatives for passenger vehicles, but heavy congestion is anticipated.
• The 101 and 110 Freeways: Commuters traveling from the northern Valley to Downtown or the South Bay may find it more efficient to bypass the 405 entirely by using the 101 to the 110 or 710 south.

Travelers heading to Los Angeles International Airport (LAX) are being given special warnings. Officials recommend leaving at least two hours earlier than usual to account for the unpredictable nature of the Sepulveda Pass congestion.

Looking Ahead: The Monday Reopening

Crews are working under a strict timeline to ensure all lanes are reopened by 5:00 a.m. on Monday. Motorists are encouraged to use real-time traffic apps and monitor local news reports for updates on specific ramp openings and closure status.

As the weekend approaches, the message from officials remains clear: if you don’t have to be on the 405 through the Pass, find another way or stay home. For a city defined by its car culture, this weekend will be a grueling test of endurance for Los Angeles drivers.