Transportation Agency for Monterey County

Highway 156

Project Benefits

  • Improves safety at intersections and local access
  • Provides traffic congestion relief for 32,000 vehicles per weekday
  • Supports $2 billion per year visitor economy
  • Facilitates movement of valuable goods to market, supports $3.8 billion per year agricultural industry

Get Involved


Highway 156 West is one of the major thoroughfares used by residents, commuters, tourists, and commercial trucks traveling to and from the Monterey Peninsula. As a result, more than 32,000 vehicles travel along this route each weekday, and Highway 156 experiences periods of heavy congestion, especially on weekends. This narrow two-lane highway can no longer accommodate this amount of traffic.

With concerns about safety and congestion, Highway 156 West has been identified by Caltrans and the Transportation Agency for Monterey County as one of the key transportation issues that must be addressed.  The Highway 156 West Corridor Improvement Project is designed to do that. The project would construct a new four-lane highway parallel to the existing Highway 156 with new interchanges constructed at Castroville Boulevard and at U.S. 101. The current two-lane highway will be converted into a frontage road that would serve the local community.  The result would be improved safety and traffic flow in the area for all drivers.

The Highway 156 Corridor project emerged as the TAMC Board’s top project from its strategic planning session. To meet the demand, the Board is seeking available sources to fund this high priority project, including tolling and a Public-Private Partnership. By exploring all options, it would be possible to expedite this project. Waiting for traditional funding sources to accrue would likely delay this project for decades.

Current Cost:

$375 million

Current Stage:

Supplemental Environmental Impact Report

Additional Information
Caltrans 156 Webpage Nov. 11, 2006 Open House
Summary Report (2mb pdf)
Final Environmental Impact Report Final Environmental Impact Report Response to Comments
Route 156 West Project Map  156 Q&A as of 9/18/2014
Route 156 West Presentation Level 1 Sketch Level 156 Toll Road Study and Appendices
Route 156 West PDA  P3 Workshop Presentation How Electronic Tolling Works: Video from Washington State
Public-Private-Partnerships in California Public-Private-Partnerships Nationally
Route 156 West Guiding Principles
Contact Information
Transportation Agency for Monterey County
(831) 775-0903
David Silberberger
(805) 549-3798