This publication is distributed by the U.S. Department of Transportation, National Highway Traffic Safety Administration, in the interest of information exchange. The opinions, findings and conclusions expressed in this publication are those of the author(s) and not necessarily those of the Department of Transportation or the National Highway Traffic Safety Administration. The United States Government assumes no liability for its contents or use thereof. If trade or manufacturers’ names are mentioned, it is only because they are considered essential to the object of the publication and should not be construed as an endorsement. The United States Government does not endorse products or manufacturers.

Note: A "d" link has been provided for each figure of this report for the purposes of providing data or a verbal explanation for each image contained in the report. This is in conformance to Section 508 (29 U.S.C. ‘ 794d and USDOT/NHTSA conventions for accessibility.

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