SAFETY EFFECTS OF CROSS-SECTION DESIGN FOR TWO-LANE ROADS - VOLUME II - APPENDIXES - FINAL REPORT

This study was intended to quantify the benefits and costs resulting from lane widening, shoulder widening, shoulder surfacing, sideslope flattening, and roadside improvements. Detailed traffic, accident, and roadway data were collected on 4,951 miles of two-lane roads in seven States. An accident predictive model and statistical tests were used to determine expected accident reductions related to various geometric improvements. Factors found to be most related to reduced accidents were wider lanes and shoulders, improved roadside conditions, and flatter sideslopes. Paved shoulders were found to have a marginal safety benefit compared to unpaved shoulders. Detailed accident analyses were also conducted for roadside features. Factors associated with increased fixed object accidents include higher traffic volumes, greater numbers of roadside objects, and closer distance of roadside objects to the road. Roadside objects associated with high accident severities include culverts, trees, utility and light poles, bridges, rocks, and earth embankments. Construction cost data from several States were used to develop a cost model for numerous types of roadway and roadside projects. This volume contains appendixes E - J.

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• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/750
• Corporate Authors:

  Goodell-Grivas Incorporated

  17320 West Eight Mile Road
  Southfield, MI  United States  48075

  Federal Highway Administration

  Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
  McLean, VA  United States  22101

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Zegeer, C V
  • Hummer, J
  • Reinfurt, D
  • Herf, L
  • Hunter, W
• Publication Date: 1987-10

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 72 p.

Subject/Index Terms

• TRT Terms: Benefit cost analysis; Bridges; Crash severity; Crashes; Cross sections; Culverts; Data collection; Forecasting; Geometric design; Highway design; Highway safety; Mathematical models; Paved shoulders; Pavement widening; Road shoulders; Roadside improvement; Rocks; Safety; Single vehicle crashes; Slopes; Statistical analysis; Traffic lanes; Traffic safety; Trees; Two lane highways; Utility poles; Width
• Uncontrolled Terms: Fixed object; Side slopes; Widening
• Old TRIS Terms: Flattening; Traffic lane width
• Subject Areas: Bridges and other structures; Data and Information Technology; Design; Geotechnology; Highways; Planning and Forecasting; Safety and Human Factors; I21: Planning of Transport Infrastructure; I82: Accidents and Transport Infrastructure;

Filing Info

• Accession Number: 00464670
• Record Type: Publication
• Report/Paper Numbers: FHWA-RD-87/009, NCP3A5a0062
• Contract Numbers: DTFH61-83-C-00117
• Files: NTL, TRIS, TRB, USDOT
• Created Date: Dec 31 1988 12:00AM