California Department of Transportation
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HPMS Data Library

California Public Road Data (PRD)

All PRD Publications are available in PDF format. Click on the link to begin the download.
2015 PRDnew 2014 PRD 2013 PRD-Revised
2012 PRD - Updated 2011 PRD 2010 PRD
2009 PRD 2008 PRD 2007 PRD
2006 PRD 2005 PRD 2004 PRD
2003 PRD 2002 PRD 2001 PRD

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Our workshops and conferences demonstrate our efforts to keep communication open and remain accessible to our partners and shareholders. We will continue to document discussions between stakeholders and share the outcomes as we move ahead and improve our processes.



A study comparing the methodology in a number of states as to how IRI data is gathered. A survey was taken and 39 states responded with information about the methods, locations and frequency for collecting IRI data. The results of the survey are summarized in the following Excel file.


Other Data and Information


For information on file formats and how to download them:

Simple instructions as needed.