Review and Enhancement for Crash Analysis and Prediction: Phase 1-Evaluation of the Crash Studies and Analysis Standard Operating Procedures in Maryland

This study offers a comprehensive review of the safety improvement programs adopted by Maryland, Federal Highway Administration (FHWA) (SafetyAnalyst), and other state agencies, focusing mainly on the following imperative issues: (1) screening and ranking high-crash locations, (2) prioritizing cost-effective projects for safety improvement; and (3) conducting before/after studies for project implementation plans. Based on the results of this review, the authors recommend that the following enhancements be incorporated into the existing safety improvement program in Maryland: (1) develop a multi-criteria method to enhance the current procedures used by the Maryland State Highway Administration to select and rank high-crash locations; (2) use safety performance functions (SPFs) and the observed crash frequency to reliably estimate the site-specific crash frequency: (3) develop and calibrate SPFs for Maryland:; (4) use negative binomial distribution to represent the variation of crash frequency; (5) develop and calibrate the crash reduction functions with local data; (6) include secondary costs/benefits in the evaluation; (7) use SPFs of the after period in estimating the do-nothing crash frequency; and (8) employ nonlinear models for estimating future traffic volume.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 60p

Subject/Index Terms

Filing Info

  • Accession Number: 01529434
  • Record Type: Publication
  • Report/Paper Numbers: MD-10-SP808B4C
  • Contract Numbers: SP808B4C
  • Created Date: Jun 9 2014 1:48PM