Impact of resolution of zoning system and road network definition on route choice and road network performance: A case study in Bandung (Indonesia)

The level of resolution of zoning system and road network definition has been accepted to obviously affect the route choice and hence the link flows. In principle, greater accuracy (in terms of link flows) could be achieved by using a more detailed zoning system and road network definition. The research describes the impact of zone aggregation and road network definition on the accuracy of traffic flows. The objectives are to justify the recommendation for zone aggregation and road network definition. Four levels of resolution, both for zoning system and road network, have been established; and there are 10 combinations have been tested. The research found that the optimum level of zoning aggregation was found in level 2 (Z(2)), where zones were Kecamatans and for the road network system was in level 3 (J(3)) in which it comprised arterial roads, collector roads, and part of local roads (50%). The optimum level for combination of zone and network definition was found in level 5 (Z(2)J(3)), where the zones were Kecamatans and the road network consisted of arterial roads, collector goads, and part of the local road (50%). Finally, it is concluded that die impact of aggregating zoning system has greater influence on the average flows rather than lowering the road network system definition.