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Edition:Final Report September 1990- August 1991
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Abstract:Small sign supports and installations represent a major and ongoing investment by the Texas Department of Transportation. The development of a generic system could result in substantial savings without sacrificing safety. To this end, during the period of 10/21/1987 - 8/31/1989, the Texas Department of Transportation and the Texas Transportation Institute conducted research project 2-18-88-1122. A single post system was developed and tested as a part of the project. In addition, a drivable anchor was developed and tested for tubular sign supports. The anchor successfully met all current federal impact performance criteria for single post installations in either strong or weak soils (NCHRP Report 230 classification S1 and S2, respectively). Also, the anchor installation proved to be fully reusable following impact by a test vehicle. The anchor is easily driven and was designed to minimize field maintenance problems (such as leaning posts). While this anchor system has received good reviews, the two-post version with current 2-3/8 inch diameter steel tube sign posts fails to meet federal impact performance criteria for low impact speeds. The concept of developing a successful generic dual post sign support system was extended under this study. Successful development and implementation of such a system would permit the vast majority of all small sign installations to be treated as a single system. This will result in substantial savings in acquisition, replacement and inventory costs.
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