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. 

Current Status:

Nine new miles of Carpool/HOV Lanes have been completed on I-5 from Lomas Santa Fe Drive to Palomar Airport Road. Additional community enhancements and improvements can be viewed under Project Highlights

Additional 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 2023, and community enhancements will be completed in 2024.

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

To receive construction alerts via text message, text BuildNCC to (760) 454-0077. 


Caltrans and SANDAG Build NCC are piloting the use of temporary orange contrast striping in Carlsbad from Palomar Airport Road to SR 78. The new striping aims to alert drivers to the work zone and reduced speed limit while enhancing safety for construction crews and motorists. The orange striping will be removed upon completion of construction in 2023. Please remember to stay alert in Build NCC construction zones and drive 55mph within the project limits. Learn more by reading the Frequently Asked Questions Document, and the Carlsbad Carpool/HOV Project Fact Sheet.


Temporary Orange Contrast Striping Pilot Program Feedback Survey 

Caltrans and SANDAG Build NCC would like to notify you of a survey to gather feedback on the temporary orange contrast striping within the active construction zones on Interstate 5 (I-5) between Palomar Airport Road in the City of Carlsbad and State Route 78 (SR 78).  

Please provide your input by taking the survey.

Survey completion takes approximately 3 minutes. We thank you in advance for helping improve safety along the North Coast Corridor.  



Encuesta sobre el programa piloto de las rayas de delimitación te

mporales de color naranja con contraste 

Build NCC de Caltrans y SANDAG desea notificarle de una encuesta que hemos lanzado para recopilar sus comentarios sobre el uso de las rayas de delimitación temporales de color naranja con contraste en la zona de trabajo activa de la Interestatal 5 (I-5), entre Palomar Airport Road en la Ciudad de Carlsbad y la Ruta Estatal 78 (SR 78).  

Por favor, proporcione su opinión respondiendo la encuesta.

Responder la encuesta toma aproximadamente 4 minutos. Gracias de antemano por ayudarnos a mejorar la seguridad a lo largo del Corredor de la Costa Norte.

Button to take Orange Lane Striping Survey


Motorists traveling along the Build NCC corridor – the eight-mile stretch of Interstate 5 (I-5) between Poinsettia Lane in the City of Carlsbad and State Route 78 (SR 78) in the City of Oceanside – are advised of a speed limit reduction to 55 mph in both north and southbound directions. The speed limit reduction will be in place until project completion in 2023.

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


Project Features

Highway Improvements

shiftsd bulidncc
bulidncc shiftsd shiftsd contactcard

Key Documents

Factsheet Factsheet Factsheet Factsheet Santa Fe/Encinitas ImprovementsI-5/Manchester Avenue Interchange Improvements