Seven different optimization scenarios were tested and are compared to the costs of the manual solution. The scenarios
vary according to the maximum duration of delivery tours, the allowed delivery time windows of customers, the number of
tours per vehicle, the loading time windows at the depot (central kitchen), possible return to the depot at the end of the day,
and whether only the given tour sequences or the whole VRP is optimised. Six different closed tour scenarios are considered
with varying maximum tour duration and time window specifications. As a result of the current practice (best approximated
by scenario 3) whereby the vehicles return to the depot to return the reusable food containers, only a single open routing
scenario is considered. Given that current practice only allows loading of a single vehicle at a time, only a single scenario
for loading 2 vehicles simultaneously is considered (Scenario 5). The scenarios and the corresponding CPU time limits are
described in Table 2