This report introduces the structural safety index and the geometric safety index. Both of these indices represent improvements that could be made to the current procedure used by the state department of highways and public transportation to select and/ or prioritize bridge projects for rehabilitation and replacement. It is also shown in this report where these indices fit into the developed computerized bridge project selection program. Background information is provided on the condition of bridges in Texas and nationwide. Current selection and prioritization methods are reviewed and the federal sufficiency rating is critiqued. The structural safety index is implemented using information contained in the guidelines for determining condition ratings. The geometric safety index is implemented using Texas accident data for 1985. Examples are used to illustrate calculation of the indices. Methods for using the indices are presented and illustrated with an example. Directions for future research are included (a).
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