Speed and Accidents Volume II

Details

• Creators:
  Finkner, A.L. ; Hill, Herbert H. ; Joscelyn, Kent B.
• Corporate Creators:
  Research Triangle Institute ; Indiana University, Bloomington. Institute for Research in Public Safety
• Contributors:
  Taylor, Robert J. ; Mela, Donald ; White, S.B., Jr. ; Dunn, J.W. ; West, L.B. ; Nelson, A.C., Jr. ; Beadles, R.L. ; White, H.J. ; Batts. J.R. ; Artz, Mary J. ; Kirk, R.E. ; Reinier, G.H. ; Merritt, J.S. ; Bryan, T.H. ; Shambach, J.L. ; Malak, S.P. ; Kinney, J.R. ; Chapman, R.L. ; Rockenbaugh, R.G. ; Connelly, F.J. ; Wolff, R.N. ; Waymire, K.J.
• Corporate Contributors:
  United States. National Highway Safety Bureau
• Subject/TRT Terms:
  Crashes Deviation (Statistics) Speed Traffic Speed
• Resource Type:
  Tech Report
• Right Statement:
  Public Domain
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Contracting Officer:
  Taylor, Robert J.
• Corporate Publisher:
  United States. National Highway Safety Bureau
• Abstract:
  In the last few years it has become the conviction of some investigators that, instead of blaming the absolute values of speeds for accidents, it may be more prudent to examine the extent to which accident-involved vehicles have deviated from the average speeds of surrounding traffic flow. The relationship between accident involvement rate and the speed deviation of the accident-involved vehicle from the average of the surrounding traffic flow was investigated during this study. Accident and speed data were collected in Monroe County, Indiana by the Institute for Research in Public Safety of Indiana University. Based on these data it is concluded that a U-shaped relationship between involvement rate and speed deviation exists. On approximately 20 miles of roadway magnetic loop vehicle detectors coupled on-line with a digital computer were used to record speed, effective length, and headway data for all detected vehicles on a full-time basis. The speeds of the accident-involved vehicles were estimated by means of accident investigation teams arriving at the scene of the accident as soon as is possible after notification of its occurrence and/or by speeds given by the computer-sensor system (CSS). The mean speed of the traffic in which the accident-involved vehicle was traveling was estimated by means of radar measurements taken both before and after the accident and under conditions as similar as possible to those surrounding the accident and/or by data from the CSS. This volume contains a detailed description of the data collection procedures, the methods used in analysis, and a tabulation of the results. A complete summary of all the information provided by the computer-sensor system would require many volumes and this information is being retained on tape by either RTI or the Institute for Research in Public Safety of Indiana University. The computer-sensor system is described in some detail in Appendix C. The summary data for all of the accidents are given in Section 6. A summary of the results is presented in Section 2 with convenient references to the section containing more detailed results.
• Format:
  PDF
• Funding:
  FH-11-6965
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:46b8245022cb3a1cde66ac42bd67a7390e693d6a3ab5f84cfd40dc966ba6e72ef08db3ffa1f194db12a9f94c3ea37c6104cacecb0d58d9fea0d9ee4026dff740
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/75135/dot_75135_DS1.pdf
• File Type:
  [PDF - 12.85 MB ]