COST-EFFECTIVENESS EVALUATION OF TURNING LANES ON UNCONTROLLED APPROACHES OF RURAL INTERSECTIONS. FINAL REPORT

摘要: Turning lanes are provided on uncontrolled approaches of rural intersections to improve the safety and efficiency traffic operations these approaches. However, there no generally accepted guidelines that define circumstances under which costs justified by benefits they provide. The objectives this research were: (1) evaluate operational effects left-turn, right-turn fly-by two-lane highways; (2) develop a methodology for evaluating cost-effectiveness lanes; (3) use cost-effective lanes. formulation was based benefit-cost analysis approach. considered were accident cost savings turning those constructing maintaining lane. lane evaluation forms designed facilitate implementation methodolgy. An intersection accidents highways in Nebraska conducted determine A computer simulation study their effects. results studies incorporated into methodology. used indicate volumes at warranted. Their development conditions intended be representative during 1983.