Technical Assistance Reports (TARs) are provided to VDOT partners. The contents of these reports reflect the views of the author(s), who are responsible for the facts and the accuracy of the data presented. The contents of these reports do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. These reports do not constitute standards, specifications, or regulations. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.