The Highway 25 Conversion is a project to improve the Highway 25 corridor between San Benito County and Santa Clara County.


The project will expand the highway to four lanes to improve safety and reduce traffic. Other planned improvements include an interchange where Highway 25 crosses Highway 156, and more options for public transportation and ridesharing.

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Project Objectives

Create Four Lanes

Improve safety by upgrading the highway with four travel lanes

Shorten Commute

Reduce the time it takes to travel between Hollister and southern Santa Clara County

Reduce Traffic

Improve traffic operations at intersections with reduced access points

Build Interchange

Enhance safety at the Highway 25/Highway 156 intersection by constructing a new interchange

More Connections

Enhance connections available on public transit, promote rideshare options, and offer alternatives to driving alone
New Highway Alignment Existing Highway 25


March/June 2020

Project Planning Begins

December 2020

Sign Agreement with Caltrans for Environmental & Preliminary Design

January/March 2021

Programming of State Funds

March/April 2021

Kick-off Environmental Phase


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Project funding

In 2018, San Benito County voters approved Measure Ga one cent sales tax for improving transportation throughout the entire region. The approved measure commits up to 50% of the tax revenues to Highway 25.  Measure G established an Oversight Committee to oversee the use of measure funds. The Oversight Committee is composed of residents that represent the geographical, social, cultural, and economic diversity of the community. Learn about other regional projects: SR 25/SR 101 Interchange Project SR 156 Widening Project SR 25 Transit Alternatives Analysis Study

About COG

The Council of San Benito County Governments (COG) addresses regional transportation needs in San Benito County. COG provides a public forum for discussion at its monthly meetings and through public participation opportunities in all of its planning efforts. The COG Board of Directors are elected officials appointed from the Hollister City Council, County Board of Supervisors, and San Juan Bautista City Council.

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