کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
979294 | 933335 | 2006 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Scaling laws in the spatial structure of urban road networks Scaling laws in the spatial structure of urban road networks](/preview/png/979294.png)
The urban road networks of the 20 largest German cities have been analysed, based on a detailed database providing the geographical positions as well as the travel-times for network sizes up to 37,000 nodes and 87,000 links. As the human driver recognises travel-times rather than distances, faster roads appear to be ‘shorter’ than slower ones. The resulting metric space has an effective dimension δ>2δ>2, which is a significant measure of the heterogeneity of road speeds. We found that traffic strongly concentrates on only a small fraction of the roads. The distribution of vehicular flows over the roads obeys a power law, indicating a clear hierarchical order of the roads. Studying the cellular structure of the areas enclosed by the roads, the distribution of cell sizes is scale invariant as well.
Journal: Physica A: Statistical Mechanics and its Applications - Volume 363, Issue 1, 15 April 2006, Pages 89–95