A load is defined to be a sequence of PICKUP stops followed by a sequence of DELIVERY stops such that once the first DELIVERY stop occurs, no further PICKUP stops can occur until the vehicle is empty.
Example:
| Stop Number | Load | Not a Load |
| 1 | PICKUP | PICKUP |
| 2 | PICKUP | PICKUP |
| 3 | PICKUP | DELIVERY |
| 4 | DELIVERY | PICKUP |
| 5 | DELIVERY | DELIVERY |
| 6 | DELIVERY | DELIVERY |