20-05-2025
Caltrans seeks feedback on proposed I-15/SR-78 interchange, added bike path
ESCONDIDO, Calif. (FOX 5/KUSI) — After years of discussions surrounding improvements to the Interstate 15/State Route 78 interchange in North County, Caltrans and other agencies involved unveiled a draft of the environmental impact report on the project Monday.
The interchange project is a collaboration between California Department of Transportation (Caltrans) District 11, the San Diego Association of Governments (SANDAG) and the city of San Marcos. The agencies released a draft environmental impact report on the proposed project Monday.
Why is the 15 freeway in San Diego both a state route and an interstate?
The estimated $490 million project aims to build a managed lanes connector ramp at the I-15 interchange with SR-78 in Escondido. It would also extend the remaining managed lanes on I-15 for three miles west in both directions on SR-78.
According to Caltrans, the reason for this is due to the east end of the SR-78 corridor having the most traffic congestion in the area. In addition, more than half of westbound traffic from the I-15/SR-78 interchange result from the first three exits along that portion of the state route, according to early traffic studies and planning data.
Another aspect of the project would reconstruct the Barham Drive and Woodland Parkway interchange to accommodate the new lanes. It would also add a separate pathway for bicyclists and pedestrians.
Depending on funding, construction is anticipated to begin in 2030. More information about the project can be found here on the Caltrans website.
To gather feedback on project elements, Caltrans and SANDAG will host a public hearing at the city of San Marcos Civic Center, located at 3 Civic Center Drive, on Thursday, June 5 from 6-7:30 p.m.
For those who would like to submit comments in other ways, they can do so online at or They can also email either of the following: or 11_2T240_project_inbox@
Other ways to submit input on the project are by calling (619) 533-4277 or sending written comment to 'Matthew Voss, Senior Environmental Planner, Caltrans District 11, 4050 TaylorStreet, MS 242, San Diego, CA 92110.'
The 45-day public comment period ends July 3.
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