Figure 2.
The diagram illustrates a manufacturer's warehouse linked to three distinct sites, represented as circles. The warehouse is labeled and shows a distance of twenty-three point three kilometres and a weight of twelve point seven tonnes leading to Site 1. Site 1 is positioned to the left of the warehouse, with a distance of three point twelve kilometres and a weight of eight point five tonnes. Below Site 1 is Site 2, which is associated with a distance of one point one kilometres and a weight of four point three tonnes. Finally, Site 3 is linked to the warehouse with a distance of twenty-four point three kilometres and a weight of zero tonnes, appearing below Site 2. All connections are represented by straight lines.Generalised trip model
Source: Authors’ own work