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A sub route is typically relevant for routes with many pickups or deliveries where it is needed to go to a depot several times to get emptied or refilled, depending upon task and capacity. This means most jobs either has the same pickup or delivery coordinates.
Number of sub routes are simply counted as the number of times a pickup job is followed by a delivery job.
Example with 2 sub routes:
Delivery1 - Delivery2 - Delivery3 - Delivery4 (empty vehicle)
Delivery5 - Delivery6 - Delivery7 (empty vehicle)
Example with 3 sub routes:
Pickup1 - Pickup2 (fill vehicle)
Pickup3 - Pickup4 (fill vehicle)
Pickup5 - Pickup6 - Pickup7 (fill vehicle)