AGGREGATE NETWORK PERFORMANCE RELATIONS: THEORY AND EMPIRICAL RESULTS

摘要: This paper contributes to a theoretical basis for studying methods of transport network aggregation, and investigates the effects various ad hoc aggregation procedures. A mathematical model is formulated. Some details are given existing methodologies aggregating networks, including link abstraction reduction abstraction. The form cost-flow function, required consistent considered. Exact results obtained some simple forms, parallel series connections between single origin destination. For more complex structures, there considerable difficulties in obtaining analytical results, but general trends indicated. Results then presented two examples: (1) an artificial circular city model; (2) its aggregates particular region Leicester, England. It found that aggregate models networks can usefully reduce both conceptual computational complexity, although they cannot fully reproduce behaviour detailed models. Thus should be used with care, especially relation practical or policy interest spatial issues. covering abstract see IRRD 869668.