An undirected graph of a road network of California.  The file
roadnet.edge contains the edge list of the graph.  Each line
represents an undirected edge of the form "u v".  An intersection or
an endpoint is represented by a node.  Two nodes are linked by an edge
if the corresponding intersections or endpoints are linked by a road.
The dataset was downloaded from

http://snap.stanford.edu/data/roadNet-CA.html

If you use this dataset, please cite the paper:

@article{LeskovecEtAl2009,
  author  = {Jure Leskovec and Kevin J. Lang and Anirban Dasgupta and
             Michael W. Mahoney},
  title   = {Community Structure in Large Networks: Natural Cluster Sizes and
             the Absence of Large Well-Defined Clusters},
  journal = {Intern. Math.},
  year    = {2009},
  volume  = {6},
  pages   = {29--123},
  doi     = {10.1080/15427951.2009.10129177},
}

Nodes: 1,965,206
Edges: 2,766,607
