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Comparative Analysis of Traffic Performance of Urban Transportation Systems

The network structure of an urban transportation system has a significant impact on its traffic performance. This study used network indicators along with several traffic performance measures, including speed, trip length, travel time, and traffic volume, to compare a selection of seven transportation networks with a variety of structures under different travel demand conditions. The selected network structures were modified linear, branch, grid, three-directional grid, one-ring web, two-ring web, and radial. Chosen for the analysis was a base origin–destination matrix to which different multiplier factors were applied to simulate various travel demand conditions. Results show that overall the two-ring web network offered the most efficient traffic performance, followed by the grid and the one-ring networks. A policy application of this study is that the branch, three-directional grid, and radial networks are suited mostly for small cities with uncongested traffic conditions. In contrast, the two-ring web, grid, and one-ring web networks are better choices for large urban areas because they offer more connectivity and thus allow them to perform efficiently under congested traffic conditions.