Optimal hierarchical system of a grid road network

For details… For details… o de s… o de s… Miyagawa, M.: Optimal hierarchical system of a Miyagawa, M.: Optimal hierarchical system of a y g , p y grid road network, Major arterial Major arterial Proportions differ considerably among wards Proportions differ considerably among wards Hierarchical system of road networks Hierarchical system of road networks e c c sys e o o d e wo s e c c sys e o o d e wo s Major arterial roads Major arterial roads Access to roadside facilities is restricted Access to roadside facilities is restricted Access roads Access roads Traffic volume and travel speed are strictly regulated Traffic volume and travel speed are strictly regulated For efficient road networks, an appropriate For efficient road networks, an appropriate hierarchical system must be established hierarchical system must be established Two main approaches Two main approaches wo pp o c es wo pp o c es Empirical Analytical Discrete network Model Continuous plane Discrete network Model Continuous plane Developing algorithms Focus Finding relationships T l Detailed data Travel demand Approximated functions C t (1986) C i ht t l (1960) Purpose Purpose u pose u pose To find the hierarchical system that To find the hierarchical system that y minimizes travel time y minimizes travel time i f d i f d Ratio of road areas major/minor arterial roads