Acknowledgements

The authors would like to thank the Utah Department of Transportation employees for the data they furnished and their assistance with this study. The authors would particularly like to thank Randy Jefferies, Brent DeYoung, and Doug Anderson for their invaluable input throughout the study.

Disclaimer

The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the information presented. This document is disseminated under the sponsorship of the Department of Transportation, university Transportation Centers Program, in the interest of information exchange. The U.S. Government assumes no liability for the contents of use thereof.