Fig. 4.

Effective long-range (high-speed) connections. (A and B) Highways with average speed faster than 70 km/h (colored in olive) during rush hours on (A) days off and (B) workdays. The district shown is a part of the city of Beijing. (C) Cumulative velocity distribution of highways on days off (olive) and workdays (orange) in the traffic network. We only focus on velocities faster than 60 km/h. (D) Critical exponent $\tau$ as a function of the fraction of rewiring links for percolation in a small world model.