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. 

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

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


I-5 Weekend Ramp Closures to Begin in Encinitas and Carlsbad 

Starting in mid-June 2020, Caltrans and SANDAG Build NCC crews will conduct the first in a series of planned weekend Interstate 5 (I-5) on- and off-ramp closures in Encinitas and Carlsbad. These closures will allow crews to realign interchange ramps with the future widened freeway. 

The first weekend ramp closure will take place from Friday, June 12, to Monday, June 15, at the northbound I-5 off-ramp to Encinitas Boulevard. 

Please see the ramp closure schedule and highlighted detour route below: 

CLOSED: Friday, June 12, at 9 p.m. – Sunday, June 14, at 6 a.m. 
TEMPORARILY REOPENED TO ALL MOTORISTS: Sunday, June 14, from 6 a.m. – 4 p.m. 
CLOSED: Sunday, June 14, at 4 p.m. – Monday, June 15, at 5 a.m. 

*Please note, construction schedules are subject to change.

Detour map

During the next 18 months, the series of weekend closures will continue on the I-5 interchanges in Encinitas and Carlsbad as part of the I-5 Carpool/High Occupancy Vehicle (HOV) Lane construction between Birmingham Drive and Palomar Airport Road. 

Weekend ramp closures are scheduled at the following cross streets: 
  • Birmingham Drive
  • Santa Fe Drive
  • Encinitas Boulevard
  • Leucadia Boulevard
  • La Costa Avenue
  • Poinsettia Lane
  • Palomar Airport Road 

All weekend ramp closures will follow the same schedule, closing on Friday evening at 9 p.m. and reopening Monday morning at 5 a.m. Each closure is expected to occur once at each location, and only one ramp will be closed on any given weekend. 

The 56-hour ramp closure reduces long-term construction impacts to immediate surrounding neighborhoods and businesses, allowing crews to safely and continuously complete ramp realignment work. 

Nearby residents and businesses can expect daytime and 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 detoured with signage and traffic controls. 

Please check back here to receive the latest up-to-date weekend ramp closures notifications and detour routes. 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
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