Calibrating the Highway Safety Manual Crash Prediction Models for Urban and Suburban Intersections in Kansas

The crash prediction models provided in the Highway Safety Manual predict crashes using traffic and geometric data for various roadway facilities, which are incorporated through safety performance functions and crash modification factors. In this study, calibration factors were estimated for four types of intersections in urban and suburban locations in Kansas: 3-legged signalized intersections (3SG), 4-legged signalized intersections (4SG), 3- legged unsignalized intersections with stop control on the minor approach (3ST), and 4-legged unsignalized intersections with stop control on the minor approach (4ST). The calibration factors were estimated as 0.64 for 3SG, 0.51 for 3ST, 1.17 for 4SG, and 0.61 for 4ST. The calibration factors show that the HSM methodology underpredicted crashes for 4SG, and overpredicted crashes for the other three intersection types. The reliability of the calibration factors was checked with the help of cumulative residual plots and coefficient of variation. Furthermore, calibration functions were developed, and their reliability was examined. The results showed that the calibration functions have better reliability as compared to calibration factors for all intersection types.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: pp 154-164
  • Monograph Title: International Conference on Transportation and Development 2019: Smarter and Safer Mobility and Cities

Subject/Index Terms

Filing Info

  • Accession Number: 01729977
  • Record Type: Publication
  • ISBN: 9780784482575
  • Files: TRIS, ASCE
  • Created Date: Aug 28 2019 3:01PM