This research was conducted to develop a cost-effectiveness model for guardrail selection that includes cost parameters for eleven (11) guardrail configurations and criteria for analysis of system effectiveness under various dynamic impact conditions. Vehicle classes include 2250-lb (1021-kg) and 4500-lb (2041-kg) vehicles. Accident severities were based on extrapolations of full-scale test data and verified by means of guardrail accident reconstruction data. Two computer programs were developed: (1) the SSCOST program for cost-effectiveness values (state cost, societal cost, total cost, and benefit-to-cost ratio) of a single specified guardrail type with given roadway conditions, and (2) the COCOST program for comparative cost-effectiveness values and ranking of the eleven guardrail types with given roadway conditions. Program inputs are simple to prepare, and computer run times are minimal. This volume is a user's manual for applying the cost-effectiveness computer programs for (1) selection at a particular site of the most cost-effective guardrail system of the eleven included types, (2) guardrail placement at a site for the optimum location and guardrail type, and (3) priority ranking of several site selections for the optimum location and guardrail type, and (3) priority ranking of several site selections for appropriation of available funds. Technical documentation supporting the computer algorithm is contained in Volume I.
Samenvatting