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INTERPRETATION <br /> The model assumes: <br /> • A fixed"startup"time of 0.65 minutes (z39 seconds). <br /> • After that, each additional mile adds 1.7 minutes (--102 seconds). <br /> • This makes the model simple, predictable, and easy to apply for planning station <br /> locations, estimating response times, and evaluating fire-protection coverage. <br /> Origin and Citation <br /> The formula is widely attributed to the Insurance Services Office (ISO), which <br /> incorporated it into its Fire Suppression Rating Schedule (FSRS). ISO cites the RAND <br /> Corporation's early fire-travel research as the basis for the constants. <br /> ISO Properties, Inc. (2007b). Fire Suppression Rating Schedule: Technical <br /> documentation. ISO Properties, Inc.,p. 1. <br /> Background: Why It's Called the"RAND Equation" <br /> The equation is based on research originally conducted by the RAND Corporation in the <br /> 1970s, which analyzed fire-engine travel times in major cities. RAND researchers found <br /> that: Travel time increases approximately linearly with distance. A fixed acceleration <br /> component plus a constant per-mile travel time best fit observed data. ISO later adapted <br /> and standardized this model for national use. <br /> 8. Conclusion <br /> The city's three closest fire stations, supported by the full six-station San Marcos Fire Department <br /> system, provide strong concentration, distribution, and reliability of emergency services. The <br /> existing configuration ensures rapid response capability, operational redundancy, and adequate <br /> resources to meet the fire protection and emergency response needs of the community. This <br /> assessment demonstrates that the current fire protection infrastructure satisfies the planning <br /> requirements of Texas Health&Safety Code§775.022 and supports continued safe development <br /> within the jurisdiction. <br />