Abstract
Travel time in a city is significantly influenced by high-speed transit system such as rapid railway, metro, or light rail transit. In this paper we treat route catchments, optimal locations of orbital-radial transit system, and its effect on travel time and modal choice within a circular city. We first consider the transportation system that minimizes average travel time with m-radial/n-ring high-speed routes, which has a finite number of radial-orbital high-speed roads and an infinite number of low-speed orbital roads. Then we apply it to analyze how travel time is influenced by the transportation network. Our modal split model shows that well-balanced orbital-radial transit system maximizes the number of users of faster transportation mode.
