The 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. 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.


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    Title :

    Field Evaluation of Edgeline Widths


    Contributors:
    W. E. Hughes (author) / H. W. McGee (author) / S. Hussain (author) / J. Keegel (author)

    Publication date :

    1989


    Size :

    63 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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