A Multimodal Passenger-and-Package Sharing Network for Urban Logistics

Table 1

Summary of notations.

Input parameters
Ω	Set of nodes representing service stores
Θ	Set of potential hub locations, Θ⊂Ω
Wij	Package demand from node i to j
Fij	Taxi flow from node i to j
rij	Proportion of taxi drivers who are willing to carry packages from node i to j, namely, “WTCP%”
θ	Average number of packages that could be contained in a taxi trunk
	Cost for establishing and operating hub k
cij	Incentive payment per package for taxi drivers from node i to j
mkl	Transport cost per package from hub k to l by metro
tij	Transport cost per package from node i to j by truck
p	Number of hubs to be established
Variables
hk	Binary variable indicating whether a hub is established at node k. 1 if so, 0 otherwise
zik	Package flow routed from node i to hub k by taxi
uik	Package flow routed from node i to hub k by tuck
yikl	Package flow emanating from node i routed from hub k to hub l by metro
xilj	Package flow emanating from node i routed from hub l to node j by taxi
	Package flow emanating from node i routed from hub l to node j by truck