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. 

Current Status:

Construction has begun on the final phase of Build NCC. This work will extend one Carpool/HOV Lane in each direction on I-5 from Palomar Airport Road in the City of Carlsbad to State Route 78 (SR 78) in the City of Oceanside creating 4 new miles of HOV lanes. This segment also includes                                                                              community enhancements like the Chestnut Avenue Intersection.                                                          Carpool/HOV construction will be complete in 2022.

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 I-5 Traffic Shift on San Elijo Lagoon highway bridge 

Beginning in early-November, Caltrans and SANDAG Build NCC highway construction crews will shift northbound and southbound Interstate 5 (I-5) traffic towards the inside of the bridge over the San Elijo Lagoon in the City of Encinitas. The traffic shifts will straighten the alignment of traffic and allow crews to finalize work on the outside shoulders. 

The southbound traffic shift will begin Monday, November 1 at 9 p.m., and the northbound traffic shift will begin Wednesday, November 3 at 9 p.m. Traffic shifts will occur from 9 p.m. to 5 a.m. Signage will be in place to guide motorists into the inside lanes on the San Elijo Lagoon highway bridge. *Please note, construction schedules are subject to change due to inclement weather including forecasted rain, fog, or cold temperatures.   

The same number of lanes will remain in each direction during and after this traffic shift.  

All motorists are reminded to Drive 55 on the 5 in the work zone for their safety and the safety of construction crews.  

Please see the highlighted route below: 

Map of traffic shift

The $870 million Build NCC project includes $195 million in funding from Senate Bill 1 (SB 1) and $322 million in TransNet funding.  

Nearby residents and businesses can expect 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 alerted with signage and traffic controls.  

Please check back here to receive the latest up-to-date 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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Visit and click “Build NCC” to receive notices.
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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