Build NCC

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 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. 

A Trio of Projects Completed!

On May 9, SANDAG and Caltrans celebrated the completion of three quality of life Build NCC projects in the City of Encinitas. The completed projects include the SanElijo Lagoon Double Track, Encinitas Coastal Rail Trail, and the Chesterfield Drive Improvements. These important projects will help improve regional connectivity, enhance mobility, maintain coastal access, and increase safety in the Cardiff-by-the-Sea community. Thank you to the community for your patience during construction! 


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 will take 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 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

Local residents, businesses, and the traveling public can expect intermittent traffic delays, noise, dust, and heavy equipment near project areas as crews work to improve transportation options along the corridor. Nearby residents and businesses will be notified in advance of construction occurring near their property or business. Crews will work to minimize noise and other impacts to nearby residents. Your patience is appreciated during construction as we bring these important transportation improvements to North San Diego County. 

While construction crews are working in the median of the highway, the outside shoulder will always remain open for motorists to pull over should they need assistance. Motorist Aid will be available during daytime and weekday hours to help stranded vehicles get back on the highway. Simply call 511 in San Diego County and say “Roadside Assistance.” 


Community members and the traveling public are reminded that they have alternative transportation choices during construction on I-5. Learn about alternate transportation solutions and assistance for employers and commuters by visiting, calling 511 and saying “iCommute”, or emailing 



Provided below are a few key facts about Build NCC and the upcoming construction on I-5. 

• The extension of the carpool lane on I-5 is part of the first phase of construction on the North Coast Corridor (NCC Program).

• Work on this portion of I-5 will include 11 sound walls. 

• The planned sound walls will be built on private property and all typically require property owner participation and consensus. To see where the sound walls are being proposed, please click here. [Link: Sound Wall board and resources]

• The carpool lane in each direction between Manchester Avenue and Palomar Airport Road, and the sound walls will be complete by late 2021. 

• The first phase of construction on the North Coast Corridor Program, also known as Build NCC, was started in 2017 and will be complete in late 2022.

• The total Build NCC cost of I-5 improvements between Solana Beach and State Route 78 (SR-78) is approximately $850 million.   

• When complete, Build NCC will include the following project components:

o 13 miles of new highway HOV/carpool lanes 

o 1.5 miles of new rail double track 

o Seven miles of new bike and pedestrian paths 

o Over 1,200 acres of restored /preserved coastal habitat 


Project Features

Highway Improvements bulidncc
shiftsd bulidncc

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