Route analysis of waste transportation vehicles in urban areas using the saving matrix method

Abstract

The increase in population in Indonesia, particularly in the city of Makassar, will be followed by an increase in the volume of waste generated. Tamalate District, as part of Makassar City, has a waste generation volume of 583 m³/day, requiring waste management to be addressed through waste collection services to handle the amount of waste produced. This study identifies the existing conditions of tangkasaki truck service routes to obtain data on service locations, number of vehicles, travel distance, travel time, and operational costs. The identification shows that there are 37 waste disposal sites served by 11 trucks at night, but the waste transportation is considered inefficient due to the underutilization of vehicle capacity. This study aims to optimize waste transportation routes with using the saving matrix method by maximizing vehicle capacity. The saving matrix method is used to evaluate fleet requirements on existing routes by considering vehicle capacity, working time, and predetermined fuel consumption. The research results show that proposed routes with the implementation of the saving matrix method can reduce the number of tanker truck fleets from 11 units to 9 units. The efficiency of travel distance is 21.7%, previously 294.4 km/day reduced to 230.4 km/day. The efficiency of travel time is 8.9%, previously 2,063 minutes/day reduced to 1,880 minutes/day by maximizing the working time of each service route and operational cost efficiency within one month of service is 22.6%, previously IDR 99,330,000.00 reduced to IDR 76,900,320.00.

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