Local Search-Based Metaheuristic Methods for the Solid Waste Collection Problem

Table 1

Model notation table.

Notations	Description
Sets
	Set of nodes
	Set of arcs
	Set of containers
	Set of waste collection trucks
Parameters
	Integer parameter to indicate the travelling distance between node and node
	Integer parameter to indicate the travelling time between node and node
	Integer parameter to indicate the service time for container
	Integer parameter to indicate the travelling time between node and node in addition to and
	Travel cost from node to node in regards to distance
	Travel cost from node to node in regards to time
	Travel cost from node to node in regards to the number of trucks
	Container maximum capacity
	Waste collection trucks maximum capacity
	Earliest time to visit container
	Latest time to visit container
Variables
	Decision variable to indicate that a node is visited right after node by a waste collection truck
	Integer variable to indicate the service starting time for node
	Integer variable to indicate the amount of load in a truck when arriving at container
	Integer variable to indicate the total number of trucks used when arriving at container