‘Carmageddon’ Returns: Major Weekend Closures Set to Paralyze LA’s 405 Freeway through Sepulveda Pass

LOS ANGELES, CA — Commuters and weekend travelers in Los Angeles are being urged to brace for significant delays as officials prepare for a series of major lane closures on the I-405 freeway starting Friday night. The planned maintenance and infrastructure work, concentrated through the heavily traveled Sepulveda Pass, is expected to create a “traffic nightmare” for one of the nation’s busiest transit corridors.

The Weekend Gridlock Begins

Beginning the evening of Friday, March 20, construction crews will initiate several lane closures that will impact both northbound and southbound traffic. The work is scheduled to continue through the weekend, with officials aiming to restore full capacity before the Monday morning rush hour. However, the reduction in available lanes is expected to cause ripple effects across the entire Los Angeles basin.

The Sepulveda Pass serves as a critical artery connecting the San Fernando Valley with West Los Angeles and the coastal communities. With hundreds of thousands of vehicles traversing this stretch daily, even a minor reduction in capacity can result in miles of gridlock. Transportation experts are warning that travel times could double or even triple during peak hours over the next 48 hours.

Reason for the Work

While Caltrans and local transportation authorities have not detailed every specific repair, the closures are part of essential infrastructure upgrades intended to improve long-term road safety and pavement durability. The work reportedly includes bridge maintenance and slab replacement—tasks that require extended periods of dry weather and continuous access to the roadway, making a weekend-long window necessary.

Planning Ahead: Alternative Routes and Strategies

City officials are strongly advising motorists to avoid the Sepulveda Pass entirely if possible. For those who must travel, the following recommendations have been issued:

• Seek Alternatives: Utilize the 101 Freeway, Laurel Canyon Boulevard, or the 110 Freeway as potential detours, though these routes are also expected to see increased volume.
• Use Public Transit: The Metro Expo Line and various bus rapid transit options may provide a faster alternative to sitting in freeway traffic.
• Telecommute: For those with flexible schedules, working from home on Friday afternoon or shifting Saturday plans could save hours of frustration.
• Stay Informed: Real-time traffic apps and local news broadcasts will be essential for monitoring the length of delays and any unexpected full closures.

A Test of Patience for Angelenos

This weekend’s project evokes memories of previous “Carmageddon” events, which saw total closures of the freeway for bridge demolition. While this weekend is not expected to be a total shutdown, the psychological and physical impact on the city’s traffic flow remains a major concern for residents and business owners alike.

Local businesses in the Santa Monica and Westwood areas have expressed concern that the traffic surge may deter customers. “We rely on people coming over the hill from the Valley,” said one local restaurant owner. “When the 405 is backed up, people just stay home.”

Looking Toward Monday

Crews will be working around the clock to ensure that all equipment is cleared and lanes are reopened by 5:00 AM on Monday morning. Until then, the message from transit officials is clear: plan ahead, stay patient, and if you don’t need to be on the 405 this weekend, stay away.

For the latest updates on lane closures and traffic conditions, motorists are encouraged to visit the official Caltrans website or follow local transit alerts on social media.