01519244

Component

Well planned and designed transit service not only resolves various problems in urbanized areas such as congestion, emission, and accidents, but also provides the mobility and accessibility required for urban activity. Imbalanced transportation infrastructures and services (e.g., centralization of services on certain areas and/or groups) may take away mobility rights from certain social groups, which can aggravate undesirable social gaps. Equitable transportation services for different income, racial and ethnic groups can reduce such gaps. This study mainly focuses on vertical equity because it is the most important perspective in the planning of transportation infrastructure and services. The goal of this study is to quantify vertical equity and then combine it with efficiency and apply these concepts to a transit network design problem. A bi-level network design problem is formulated with an upper level consisting of efficiency and vertical equity and a lower level that finds the traffic flow pattern with mode share satisfying user equilibrium (UE). NSGA-II algorithm finds Pareto optimal solutions for bi-level multi-objective network design problems. Three different scenarios show meaningful differences, and the trade-off between efficiency and vertical equity is discussed. When efficiency and equity are the joint objectives in transit network planning, the network configuration is entirely different than when there is only a single objective.

This paper was sponsored by TRB committee ABE60 Accessible Transportation and Mobility.

01503729

14-3680

English

17p

2014

Transportation Research Board 93rd Annual Meeting

Digital/other

Figures; References; Tables

Accessibility; Equity; Mobility; Modal split; Traffic flow; Urban areas

Network design problem; User equilibrium

Design; Planning and Forecasting; Public Transportation; I20: Design and Planning of Transport Infrastructure

Transportation Research Board Annual Meeting 2014 Paper #14-3680

TRIS, TRB, ATRI

Jan 27 2014 3:16PM