Analyzing the effect of the street network configuration on the efficiency of an urban transportation system

This paper proposes a new specialized centrality measure to quantify the importance and the contribution amount of each street in an urban transportation network. Contrary to the previous general centrality measures (e.g., degree, betweenness, and closeness), this measure considers three important vehicular traffic characteristics: street capacity restrictions, the dominant pattern of travel demands, and the traffic-flow equilibrium. Applying the developed centrality measure to simulated networks shows that traffic flows more efficiently in urban networks with small-world configurations, where a certain number of shortcut links and locally clustered streets are allowed. However, with regular grid networks, the application of the proposed measure shows little efficiency. This outcome suggests that the regular grid is not suitable as a base structure in urban planning. (c) 2012 Elsevier Ltd. All rights reserved.