Enhancing and generalizing the two-level screening approach incorporating the Highway Safety Manual (HSM) methods, phase 2.

Details

• Creators:
  Abdel-Aty, Mohamed Ahmed ; Lee, Jaeyoung ; Eluru, Naveen ; Cai, Qing ; Al Amili, Samer ; Alarifi, Saif
• Corporate Creators:
  University of Central Florida. Dept. of Civil, Environmental and Construction Engineering
• Corporate Contributors:
  Florida. Department of Transportation
• Subject/TRT Terms:
  Crash Analysis Florida-specific SPFs Geography High Risk Locations Hotspot Identification Integrated Screening Intersections Macroscopic Analysis Methodology Microscopic Analysis Network Screening SPFs Traffic Safety Safety Performance Functions

  More +
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States;Florida
• Edition:
  Final Deliverable (Draft)
• Corporate Publisher:
  Florida. Department of Transportation. Research Center
• Abstract:
  This project aims at developing a novel methodology to identify traffic safety hotspots and hot zones for at the macroscopic
  
  and microscopic levels. In order to achieve these objectives, the following tasks were performed. The research team
  
  followed the HSM screening procedure and extended it to the macroscopic level. TAZs (Traffic analysis zones) have been
  
  most widely used as a spatial unit for macroscopic analysis; however, TAZs have two disadvantages: small size in urban
  
  areas and high percentage of zonal boundary crashes. Thus, we have suggested two ways to overcome this issue. The first
  
  way is to develop a new study unit – Traffic safety analysis zones (TSAZs), created by aggregating existing TAZs with
  
  similar crash rates. The second way is to apply a larger geographic unit such as TADs (Traffic analysis districts) or counties.
  
  We explored traffic safety not for TAZs only but also for TSAZs, TADs, and counties. The research team developed a series
  
  of SPFs (Safety performance functions) both at the macro-level and micro-level for 17 crash types. At the macro-level,
  
  overall, 204 SPFs were developed based on SWTAZs (Statewide TAZs), TSAZs, TADs, and counties. The research team
  
  has found various contributing factors for each traffic crash type at the macro-level. At the micro-level, overall, 404 Floridaspecific
  
  SPFs were estimated for 13 segments and 16 intersection facility types. Before the research team proceeded to the
  
  screening analysis, we performed a grid structure analysis to identify the best geographic units. The results showed that
  
  SWTAZs are the optimal zone system for analyzing non-motorized crashes such as pedestrian and bicycle crashes. On the
  
  other hand, TADs are found to be the best geographic unit for all other crash types. Subsequently, screening analysis was
  
  conducted at the two-levels using PSI (Potential for Safety Improvement) and ranked. Two stage screening could be
  
  suggested as a simple way to identify high risk locations. The screening results from the two-levels were integrated, and all
  
  the results were provided in Excel spreadsheets for the convenient application of practitioners. It is intended that the results
  
  of the project would provide a comprehensive perspective on appropriate traffic safety plans and help practitioners screen
  
  and rank any area, segment, or intersection in the state.
  
  
• Format:
  PDF
• Funding:
  BDV-24-977-06
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:9bed4182095245e91f8c1a9a03c3f5420770464967b0146fc983fb2a3eb44917201ad2c4e8c15cefe797705a9d31c4ce6e58f7b9f3579d1f04d7f8b327304f7e
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31006/dot_31006_DS1.pdf
• File Type:
  [PDF - 12.33 MB ]