A Geometric Classification of World Urban Road Networks

This article presents a method to uncover universal patterns and similarities in the urban road networks of 80 most populated cities world. To that end, we used degree distribution, link length intersection angle distribution as topological geometric properties networks. Moreover, ISOMAP, nonlinear dimension reduction technique, better express variations across cities, K-means cluster cities. Overall, uncovered one pattern between number nodes links all identified five classes Gridiron Cities tend have many 90° angles. Long Link disproportionately high long include mostly Chinese developed towards end 20th century. Organic short more non-90 180° angles; they also relatively historical Hybrid both links; evolved historically recently. Finally, Mixed exhibit features from other classes. These findings can help transport planners policymakers identify peer share similar characteristics use their craft tailored policies.