چكيده به لاتين
Fixed route taxi is known as one of the common mods of semi-public transportation in Iran. Considering the importance and impact of fixed route taxi network on the objectives of the system stakeholders, including drivers, passengers, environment and the managing organization, which are sometimes in conflict with each other; upgrading and improving the network design seems essential. In this study, the problem of redesigning fixed route lines has been mathematically modeled to select the route, fleet size and determine the desired frequency. From the driver's perspective, maximizing the minimum driver's profit in each line, from the passenger's perspective, minimizing the travel time from the closest route of each line, and from the environmental perspective, minimizing the CO emission situation in each line, are considered as the objectives of the problem at three levels. Most research in transportation network design considers the objectives related to minimizing travel time and operator cost, and other objectives such as minimizing pollutant emissions have been considered in very limited studies; therefore, the issue of emission is also included in the this research. Also, studies conducted in the world are focused on the bus line network. Considering the differences in the operational strategy of the linear taxi in the possibility of getting on or off the passenger along the line; therefore, a new modeling was felt to solve the problem, which was also considered in this research. The case study of the Mandl network was selected for the initial test and the fixed route network of Mashhad was also selected for redesign. Considering the three-objective nature of the model, the LP-metric method was used to combine the results and provide the final answer. 200 lines included 2988 taxis related to the initial design of the existing situation and the existing proposed lines. The decision of the managing organization for the redesign was that the demand coverage percentage should be at least 90 percent, a maximum of 400 taxis and a maximum of 100 lines should be selected. In the final results, 333 taxis in 83 lines were selected to meet the demand of 32119 passengers. The minimum monthly income of drivers is 5,224,880 Tomans, the amount of CO emissions is about 4,652 kg, and the cost of passengers (distance from the nearest route) is approximately 29,316 km, which means an average of 913 meters per passenger.
