Build NCC

Sign up for updates

Highway, rail, environmental, and coastal access improvement projects are underway in the cities of Solana Beach, Encinitas, and Carlsbad as part of Build NCC, the first package of projects being constructed through the 40-year North Coast Corridor (NCC) Program.

Build NCC includes rail double tracking, extended Carpool/High Occupancy Vehicle (HOV) Lanes, new bike and pedestrian trails, and the restoration of the San Elijo Lagoon. These highway, rail, and lagoon improvements are being constructed simultaneously to minimize impacts to the lagoon and neighboring communities. 

Questions? Call our construction hotline at (844) NCC-0050 or email us at

To receive construction alerts via text message, text BuildNCC to 313131. 


Upcoming Northbound I-5 Off-Ramp Closure to Birmingham Drive (September 24 – September 27, 2021)

Caltrans and SANDAG Build NCC crews will conduct a planned Interstate 5 (I-5) weekend on-ramp closure in the City of Encinitas. Weekend on- and off-ramp closures allow crews to realign interchange ramps to accommodate two new Carpool/High Occupancy Vehicle (HOV) Lanes: one in each direction on I-5.

The ramp closure will begin Friday, September 24, at 9 p.m., and reopen on Monday, September 27, at 5 a.m. at the northbound I-5 off-ramp from Birmingham Drive. Detour signage will be in place to guide motorists around this closure via northbound I-5 to Santa Fe Drive. *Please note, construction schedules are subject to change.

Please see the highlighted ramp closure detour route below:

 closure map

The $870 million Build NCC project includes $195 million in funding from Senate Bill 1 (SB 1), the Road Repair and Accountability Act of 2017. 

Weekend ramp closures reduce long-term construction impacts to immediate surrounding neighborhoods and businesses and allow crews to safely and continuously complete ramp realignment work.

Nearby residents and businesses can expect daytime and overnight construction noise and lights, including Occupational Safety and Health Administration (OSHA) required vehicle back-up alarms. Crews will work to minimize noise and impacts to all nearby communities, and motorists will be detoured with signage and traffic controls. 

Please check back here to receive the latest up-to-date weekend ramp closure notifications and detour routes. To receive construction updates by text message, text “BuildNCC” to 313131. 


Motorists traveling along the Build NCC corridor – the eight-mile stretch of Interstate 5 (I-5) between Manchester Avenue in the City of Encinitas and Palomar Airport Road in the City of Carlsbad – are advised of a speed limit reduction to 55 mph in both the north and southbound directions. The speed limit reduction took effect on March 11, 2019, and will be in place until project completion in 2022.

The speed limit reduction within the highway work zone is necessary to ensure the safety of the traveling public, and construction and public safety professionals as they work to construct the new I-5 Carpool/High Occupancy Vehicle (HOV) lanes. Construction signage will alert drivers as they enter and exit the construction zone. Electronic speed feedback signs also will be present to inform the public of their speed in relation to the reduced speed limit. Additionally, the California Highway Patrol will be actively working to ensure motorists are driving safely by enforcing the new, posted speed limit. To learn more about the reduced speed limit, click here

To view previous Construction Alerts, please visit the Build NCC Construction Notices webpage.


Project Features

Highway Improvements
shiftsd bulidncc

Visit and click “Build NCC” to receive notices.
shiftsd bulidncc shiftsd shiftsd contactcard

Key Documents

Factsheet Factsheet Factsheet Factsheet Pre-Construction Open House Display BoardsSanta Fe/Encinitas ImprovementsI-5/Manchester Avenue Interchange ImprovementsSegment two open house display boards