A unifying modelling framework to simulate the Spatial Economic Transport Interaction process at urban and national scales

A comparison of vehicle routing approaches with link costs variability: an application for a city logistic plan

“…www.witpress.com, ISSN 1743-3509 (on-line) real conditions in the network instant by instant (this can be useful in planning and simulation [33,34]). In this case, the link cost is a function of link flows and time: c t = c(f t , t) where  f t is the time dependent flow vector with entry f i the flow on link i;  t is the time.…”

An integrated approach for road, transit design in a city logistic plan: a case study

“…The city delle , , logistic distribution can be managed using the designed network for road and transit. This design aspect can be a component of a general framework able to simulate the transport interaction in an urban context [1] ant the behavioural aspects of urban freight distribution [2]. The NDP is classified, in consolidated literature, relating to the variables involved in the problem.…”

“…subject to technical, economic, normative, behavioural constraints where: z is the objective function; f is the link flow vector in the multimodal (road and transit) network that contain  a link flow vector f (r) for road;  a link vector f (t) for transit;  a link vector f (f) for freight; y is the configuration vector that contains  a sub-vector y (1) of configuration variables relative to the junction setting;  a sub-vector y (2) of configuration variables relative to the link layout;  a sub-vector y (3) of configuration variables relative to the transit routes layout;  a sub-vector y (4) of configuration variables relative to the freight routes layout.…”

“…, y (1) y (2) , y (3) , y (4) ) (2) where  α 1, α 2 are weights;  z 1 is the cost for the transit users and system manger;  z 2 is the cost for the road users and system manger;  z 3 is the cost for the freight system.…”

“…It represent the first tentative route transit network to be improved in the second sub-model, together with the road network. Note that in this sub-model the objective function is z 1 .…”