Evolution Mechanism of Roads Network

In the article, self-organization framework of road network structure was established, and the evolution process was simulated. At first, fascination model was introduced to study the connection probability of each city, based on which, initial road network was established. Then, the saturation of each road can be got through stochastic equilibrium assignment on the initial road network. At last, based on the purpose of improving travel efficiency, road network was updating through expanding network scale or improving road hierarchies, which aimed at searching the stable network structure to meet certain service level. A city- circle as an example, road network evolution frame was simulated. It finds that, roads between hub cities and other major cities have higher level; internal road hierarchies are higher than the external on the circle; first performance of the evolution is scale expansion of road network, followed by the emergence of high-grade roads.