[2nd revision].; Text document in PDF format.; Title from PDF title page (viewed on September 16, 2009).; "Report #21 in the series: The Annualized Social Cost of Motor-Vehicle Use in the United States, based on 1990-1991 Data."; "August 1996....
Title from PDF title page (viewed on February 15, 2011).; "August 2009."; Includes bibliographical references (p. 171-178).; Final report.; Text document (PDF).; Performed for California Dept. of Transportation under contract no.