Interstate 15 (I-15) / State Route 78 (SR 78) Managed Lanes Direct Connectors Project 

Project Overview


In fall 2019, Caltrans, in partnership with the San Diego Association of Governments (SANDAG) and the City of San Marcos, began the environmental process to evaluate Managed Lanes Direct Connectors between Interstate 15 (I-15) and State Route 78 (SR 78). The project also proposes to extend the Managed Lanes from I-15 for approximately three miles onto SR 78 and construct operational and intersection improvements at Woodland Parkway/Barham Drive. 

The project will bring relief to an area of the region that has experienced tremendous residential and job growth over the past 25 years and the improvements are expected to improve connectivity and traffic flow on and between two major travel corridors, increase local access to homes and jobs, and improve overall quality of life in North Inland San Diego County.

The anticipated three-year required environmental review phase is a critical step in evaluating the environmental impacts of a project and ensure compliance with federal, state and local environment laws.

To view the project fact sheet, click here (English) (Spanish).

Project Components


The I-15/SR 78 Managed Lanes Direct Connectors project will improve connectivity by:

  • Building Managed Lanes Direct Connectors between I-15 and SR 78.
  • Extending three miles of Managed Lanes in each direction on SR 78 between the interchange and San Marcos Boulevard.
  • Adding a westbound auxiliary lane between Nordahl Road and Woodland Parkway/Barham Drive.
  • Relocating the eastbound SR 78 on-ramp from Barham Drive.
  • Widening and realigning Barham Drive from La Moree Road to Woodland Parkway.
  • Replacing the Woodland Parkway undercrossing.
  • Constructing a bike facility on Barham Drive/Woodland Parkway.
Project Map

Project Status

The I-15/SR 78 Managed Lanes Direct Connectors project is in the early stages of a three-year environmental review process. Numerous opportunities to provide comment on the project will be available. The Draft­ Environmental Impact Report (EIR) is expected to be released for public review and comment in late 2022 and a Final EIR is anticipated in late 2023.

Project Timeline

The project is one component of a Comprehensive Multimodal Corridor Plan (CMCP) study being undertaken by Caltrans and SANDAG, that uses a holistic approach towards integrating highway, transit, and mobility projects along SR 78.

Key Documents

Project Factsheet English  Fact Sheet Spanish
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