Design of Route Deviation and Demand Responsive Transit Services
Date Issued
2012
Date
2012
Author(s)
Tsai, Shin-Yun
Abstract
Demand Responsive Transport Services (DRTS) is an advanced, user-oriented form of public transport characterized by flexible routing and scheduling of small/medium vehicles operating in shared-ride mode between pick-up and drop-off locations according to passenger’s needs. DRTS can provide more affordable and convenient transport service and can reduce the vacancy rate and raise the passenger load-factors.
However, DRTS is a new transport service in Taiwan and type of service of DRTS needs to be designed based on the service area’s features. Therefore, this study developed a mathematical model to analyze optimized design of DRTS while minimum total system cost is considered as the objective function.
The system provided a scheduled bus service in main line which allowed deviate from the fixed route to service some of the branch line in the area and the rest of the area is served by flexible route DRTS. In this mixed fleet system, the optimal length of route deviation and fleet size are the decision variables.
Moreover, numerical examples are used to verify the applicability of this model. The example shows that, when the length of service area is 16 km and width is 9 km,, the optimal length of route deviation is 2.04 km for demand density of 125 trips per hour. Optimal fleet size of scheduled bus service is five mini-buses and optimal fleet size of DRTS is six. Sensitive analysis is also conducted to evaluate the effects of important parameters on the system design. The length and width of service area and demand density of branch line are most sensitive to the total cost. And vehicle kilometers cost and walking speed are least sensitive to the total cost. Results of this study could be used as a guideline for design and planning of the demand responsive transit system.
Subjects
Demand responsive transit services (DRTS)
Analytic mathematical model
Route deviation
Mixed fleet
Fleet size
Type
thesis
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