State Planning and Research program (80 % Federal Highway Administration and 20% State transportation funds). Disclaimer The statements and conclusions in this report are those of the authors and advisory committees and not necessarily those of the Federal Highways Administration, California Department of Transportation or participating agencies. The mention of commercial products, their source or their use in connection with material reported herein is not to be construed as either an actual or implied endorsement of such products. Copyright Information The text of this document and any images (e.g., photos, graphics, figures, and tables) that are specifically attributed (in full, or in coordination with another group) to the California Department of Transportation may be freely distributed or copied, so long as full credit is provided. However, this document also includes a number of copyrighted images (e.g., photographs, illustrations, graphics, figures, and tables) that are not owne
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