FIELD EVALUATION OF EDGELINE WIDTHS. FINAL REPORT

This report documents an evaluation of the effectiveness in terms of safety and cost of 8-in. (20 cm) wide edgelines on two-lane rural roads compared to 4-in. (10 cm) wide edgelines. In order to assess the incremental benefits attributable to the wider lines, a before-versus-after experimental design with a control group was developed. With the assistance of State highway departments in Alabama, Maine, Massachusetts, New Mexico, Ohio, South Dakota, and Texas, over 2,000 miles (3200 km) of two-lane rural roads were restriped with either 8-in. (20 cm) edgelines or 4-in. (10 cm) wide edgelines. Using log-linear modeling and conventional statistical analysis techniques, the accident data collected over a 2- to 3-year period before the edgelines were applied were compared with accident data collected over a 1- to 2-year period after the edgelines were applied. Based on the available data, there appears to be little of evidence to suggest that, in general, 8-in. (20 cm) edgelines produce an incremental accident reduction compared to 4-in (10 cm) edgelines on two-lane rural roads with Average Daily Traffic (ADT) volumes between 5,000 and 10,000 vehicles per day. The analysis did reveal that 8-in. (20 cm) edgelines were more effective under certain conditions and that they could be a cost-effective alternative to 4-in. (10 cm) edgelines. Finally, suggestions as to when and where 8-in. (20 cm) edgelines should be applied on two-lane rural roads are presented.

  • Corporate Authors:

    Bellomo-McGee, Incorporated

    8330 Boone Boulevard
    Vienna, VA  United States  22182

    Federal Highway Administration

    Turner-Fairbank Highway Research Center, 6300 Georgetown Pike
    McLean, VA  United States  22101
  • Authors:
    • Hughes, W E
    • McGee, H W
    • Hussain, S
    • Keegel, J
  • Publication Date: 1989-12

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 60 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00495674
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RD-89-111, 3A5A 0112
  • Contract Numbers: DTFH61-84-C-00092
  • Files: TRIS, USDOT
  • Created Date: Jul 31 1990 12:00AM