Identifying traffic safety needs – a systematic approach : research report and user manual.

Details

• Creators:
  Tarko, Andrew P. ; Azam, Shafiul Md ; Thomaz, Jose ; Romero, Mario
• Corporate Creators:
  Purdue University. Joint Transportation Research Program
• Corporate Contributors:
  Indiana Department of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Computer Programs Computer Tool Highway Safety Risk Assessment Road Safety Roads Screening Safety Safety Factors Safety Management Safety Needs Safety Programs Software Traffic Safety Transportation Safety

  More +
• Publication/ Report Number:
  FHWA/IN/JTRP-2012/02
• Resource Type:
  Tech Report
• Geographical Coverage:
  Indiana
• Corporate Publisher:
  Purdue University. Joint Transportation Research Program
• Abstract:
  The Indiana Department of Transportation (INDOT) manages road safety in Indiana through safety emphasis areas, identification of
  
  safety needs within these areas, and development and implementation of transportation interventions that address the safety
  
  needs. Indiana applies system-wide performance screening to state roads using the somewhat limited, non-integrated tools
  
  available to date. A site-specific countermeasure development and evaluation process (scoring) is being used to determine essential
  
  project intent and merit or cost-effectiveness. This projects addresses the need for a unifying approach to data-driven identification
  
  of safety emphasis areas and safety improvement projects via a systematic evaluation of safety needs in the Indiana road network.
  
  Such a method must utilize a database that integrates the Indiana state network, traffic, road inventory, and crash data.
  
  A method for safety screening of state roads in Indiana was developed with the following screening tasks in mind: (1) Identification
  
  of high crash locations (segments, intersection, ramps and bridges), corridors, and areas in terms of high crash frequency, crash
  
  rate, or proportion of a particular crash type. (2) Facilitate program-based screening (e.g., shoulder widening, median improvement,
  
  etc.). (3) Facilitate special programs and projects (e.g., five percent report)
  
  In order to ensure the versatility of screening tasks and the data maintenance, four components are included in the screening tool:
  
  (1) data management, (2) standard screening, (3) roads clustering and special studies, (4) results presentation. The data
  
  management includes updating the existing data by utilizing renewable sources for data, reformatting the source data to meet the
  
  standards of the master database, integrating these data into tables that meet certain specifications, and replacing the existing
  
  data. The data management procedures include ArcGIS geo-processing and VBA-implemented and Model Builder codes that are not
  
  packaged as a single module but which are used separately as needed to maintain flexibility of the data management process.
  
  A window-based user interface, query editor, facilitates selection of criteria for safety screening. To help the user build a query, the
  
  selection criteria have been grouped into four categories: geographical scope (state, county, etc.), element (segment, township,
  
  etc.), crash criteria, and road criteria. The query is translated to SQL and sent to the screening engine. The results include safety
  
  performance measures such as crash frequencies, rates, and proportion together with basic statistical indicators. Road segments
  
  and intersections that exhibit an excessive number of crashes may be concentrated along longer road sections. Clustering these
  
  elements may reveal large scale safety issues that otherwise might be overlooked if the screening analysis is focus on individual
  
  spots. The geo-coded results can be sorted in a table or displayed on GIS maps with Google Earth or ArcGIS to visualize the spatial
  
  distribution of the identified high-crash roads.
  
  
• Format:
  PDF
• Funding:
  SPR-3315
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:f7d12a6c4d443269b0409aa65cac10ab228dee7cc1923474f7b4a37bea4829b4
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24087/dot_24087_DS1.pdf
• File Type:
  [PDF - 43.91 MB ]