This paper explores the problems of the transport routes. There is a case study Postal canals pry the. Crash la. Sadao Songkhla., Which is intended to improve transportation routes. And reduce the cost of shipping. The process of using GPS to find the coordinates of each customer and use the Google Map to find the distance between each customer. And applying the Clark-Wright Saving Heuristic to calculate a new route. The results showed that the path from the original bus 12.267 kilometers will be reduced to 12.148 km or dropped 0.119 kilometers, representing 0.9% or lower costs, down 0.97 baht / trip later adjusted the route using. Lingo program based on findings that could provide a new path. Down from the 12.267 km distance will be reduced to 8.88 kilometers, fell by 38%, or 3.387 kilometers can reduce costs up to 3.2176 baht / trip.
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