State of the Practice in Supports for Small Highway Signs
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1980-04-01
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Abstract:This study has as its basic purpose the development of objective criteria and methodologies to assist the engineer in the selection of a sign support system. To accomplish this objective, four tasks were required. These were to (1) survey existing practices, (2) evaluate the crashworthiness of widely used support systems and promising new systems, (3) develop methodologies whereby candidate systems could be evaluated on a cost-effective basis, and (4) to the extent possible, identify the relative cost-effectiveness of current systems. This report presents the results of Task 1 and a part of Task 2 as described below. Results from the other tasks will be published in subsequent reports. It is the intent of this report to provide state-of-the-practice information on small sign supports. Included are statistical data on sign use, design data, cost data, and maintenance data. Chapter II describes the methods used to obtain the desired information. Chapter III contains a summary of the more significant results of the survey. Detailed data on all phases of the survey are given in Appendix C. These data relate primarily to signs now in service. Some agencies indicated they were in the process of changing their standards while others indicated they were contemplating changing standards. A literature search was also conducted to determine the extent to which existing sign support systems met current safety standards. Results of this search are included in Chapter IV. Small signs were arbitrarily defined as those having a total panel area less than 50 square feet (4.65 square meters). As such, the major portion of the study relates to supports for regulatory signs and warning signs. Some guide signs are also in this category. No attempt is made in this report to evaluate the current sign support systems in terms of their cost-effectiveness. Such an evaluation is planned in the latter phase of the contract.
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