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Page Mill Road Expressway: 280 to El Camino Real

Published on: 11/20/2015 8:49 AM


The Page Mill Road Expressway Study project identifies improvements to relieve congestion and improve pedestrian and bicycle connectivity along the expressway and at intersections between I-280 and El Camino Real.  

The Page Mill Road Expressway Corridor Study report is now available.

In recognition that it may take several years to fund, design, and construct the interchange improvements identified in the Study, the repot also includes a concept plan for interim bicycle improvements through the interchange area.  The County, Caltrans, VTA, Town of Los Altos Hills, and City of Palo Alto staff are working together to identify funding sources to implement the interim bicycle improvement concept in the short term.

An overview of the study will be provided to the Los Altos Hills Town Council on June 18, 2015; to the Palo Alto City Council on June 22, 2015; and to the Palo Alto Planning and Transportation Commission on June 24, 2015.

Click here to view presentation slides. The County is accepting comments on the Study Report until August 7, 2015. Please submit comments by e-mail to or in writing to:

     Transportation Planning

     County of Santa Clara Roads and Airports Department

     101 Skyport Drive

     San Jose, CA  95110 

Stay tuned for updated project information and upcoming public meetings or receive the information by clicking the button below and subscribing to our project update list.

Get Involved



This technical memorandum documents the traffic analysis assumptions, methodology and findings for the Page Mil Road/Coyote Hill Road intersection comparing two potential improvement alternatives to each other and existing conditions. The improvement options are closure of the median gap along Page Mil Road, effectively allowing right-in/right-out access only to/from Coyote Hill Road and signalization of this intersection.

Intersection Analysis Report



The project team has been working closely with City of Los Altos Hills, City of Palo Alto, Caltrans, and VTA staff for input on the technical analysis, including concepts to illustrate potential project configurations. The concepts are planning level drawings (not design level) to determine technical feasibility, potential right-of-way impacts, a cost estimate for the Plan list, and community acceptability. There are three alternative concepts each for the Page Mill/I-280 interchange improvements and for grade separating the Page Mill/Foothill-Junipero Serra intersection.  A final proposed concept for each of these two locations will be one of the alternatives shown or a hybrid/modified concept based on the analysis of the alternatives and community input. 

Page Mill/I-280 Interchange Alternatives

Concept 1-Signalization

Concept 1-Signalization Bike and Ped Facilities

Concept 2-Southbound Ramp Realignment

Concept 2-Southbound Ramp Realignment Bike and Ped Facilities

Concept 3-Roundabout Concept

Concept 3-Roundabout Concept Bike and Ped Facilities


Traffic Simulations Videos: Using a traffic demand model, traffic flow simulations have been developed for the AM and PM peak periods for each of the alternatives using projected 2025 traffic volumes.  Videos of the simulations have been posted on YouTube (click here).

Existing Condition AM

Existing Condition PM

Concept 1 Signalization AM

Concept 1 Signalization PM

Concept 2 Southbound Ramp Realignment AM

Concept 2 Southbound Ramp Realignment PM

Concept 3 Roundabout AM

Concept 3 Roundabout PM


Page Mill Road Expressway

Page Mill Expressway between Foothill Expressway and El Camino Real Intersection Improvements

Page Mill Overcrossing Foothill Expressway Alternative 1

Page Mill Under Elevated Foothill Expressway Alternative 2

Page Mill Under Foothill Expressway Alternative 3

Page Mill Between 1-280 and Foothill Expressway Widening to 6 Lanes with Trail

Page Mill at El Camino Expressway


Community Outreach  

As part of the Expressway Plan 2040 Project, Community Meetings were held this fall by Expressway. 

Click here for meeting details; flyers, presentation and summaries.

To see the entire list of meetings return to the Expressway Plan 2040 Project website.


 Project Fact Sheets, Documents and History 

The PageMill280 FACT SHEETS and System Maps are available on a separate page.

The project documents and history are available on a separate page.