Build NCC

Highway, rail, environmental, and coastal access improvement projects are underway in the cities of Encinitas and Solana Beach 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, with the majority of work beginning in Encinitas. These highway, rail, and lagoon improvements are being constructed simultaneously to minimize impacts to the lagoon and neighboring communities. View the San Elijo Lagoon Construction Staging Maps to see how Build NCC will be integrated.

View information on the Chesterfield Drive Rail Crossing Closure.

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

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


Beginning late November, construction crews are set to begin work to extend a HOV/carpool lane on Interstate 5 (I-5) in each direction between Manchester Avenue in the City of Encinitas and Palomar Airport Road in the City of Carlsbad. 

As part of this work, construction crews will begin placing concrete barriers (K-Rail) on the inside shoulder of I-5 from Manchester Avenue to Palomar Airport Road. The barriers, which are expected to be in place on the inside shoulder for approximately the first 18 months of the project, will be used for crews to safely work in the median, protect drivers from construction zones, and will result in reduced lane widths along I-5. 

Construction map


Once the inside shoulder widening work is complete, concrete barriers will be placed on the outside shoulder of I-5 and will include intermittent on- and off-ramp closures in order to widen the highway. The barriers are expected to be in place on the outside shoulder for approximately 18 months. 

The construction activities associated with the placement of concrete barriers on the inner shoulder of I-5 will occur between the hours of 9 p.m. and 5 a.m. over eight to 10 weeks (excluding Friday and Saturday nights, and holidays). Work will begin at Manchester Avenue and move north on northbound I-5, and then return south on southbound I-5 beginning at Palomar Airport Road. 

K-rail placement

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

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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