Build NCC

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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 Build NCC I-5 Traffic Shifts Between Manchester Ave. & Birmingham Dr. (January 25 and January 28, 2021)

In late January, Build NCC highway construction crews will shift all Interstate 5 (I-5) travel lanes toward the center median – four lanes in both the northbound and southbound directions – between Manchester Avenue and Birmingham Drive in Encinitas. Preparatory overnight work for the traffic shifts will begin Sunday, January 24, to relocate concrete barriers.

Crews anticipate striping the new travel lanes according to the schedule below*:  

Wednesday, January 25 (9 p.m. – 5 a.m.) – Northbound I-5

o   New northbound I-5 travel lanes opened to motorists on Thursday, January 26, at 5 a.m.


Wednesday, January 27 (9 p.m. – 5 a.m.) – Southbound I-5

o   New southbound I-5 travel lanes opened to motorists on Thursday, January 28, at 5 a.m.

Please see the highlighted traffic shift map below:

Traffic Shift Map

The same number of lanes will remain in each direction during and after these traffic shifts. Overnight temporary lane closures will be required, but no full freeway closures are planned. California Highway Patrol will provide short traffic breaks to lead motorists into the newly shifted lanes. Motorists are advised to remain Work Zone Alert while traveling through construction zones.

The traffic shift will accommodate continued I-5 Carpool/High Occupancy Vehicle (HOV) Lane outside shoulder construction in this area. *Please note, construction schedules are subject to change.

Nearby residents and businesses can expect construction noise and lights during this activity, including Occupational Safety and Health Administration (OSHA) required vehicle back-up alarms. Crews will work to minimize noise and impacts to all nearby communities.

Please check back here to receive the latest up-to-date traffic shift notifications. 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
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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