The evacuation plan presented includes three safe zones locations. The buffer distance for these safe zones is 500 meters. The importance of evacuation beyond this buffer distance increases with the increased evacuation distance and time. Thus, given three safe zone locations, the task is to optimize routes from incident sites by minimizing distance and congestion, maximizing the spatial association with geographic features, and maximizing coverage to evacuees. A final optimization that will maximize the total score, which is a linear weighted combination of all the above factors is also desired. Table 3.1 shows the criteria for the two objectives. Using weighted linear combination (Voogd, 1983), the criteria parameters are combined by applying scaled weights based on two parameters each, for weights of evidence and routes. Thus, where, S is the suitability index, wi is the weight of factor i and xi is the criterion score of factor i. The criterion weights for the factors are computed using the WoE method, while the criterion weights for the constraints are computed using a cost function.