Shipping Condition in Shipment doc

Was wondering what is the significance of Shipping Condition in the Shipment doc.

I am trying to see if I can use the Shipping condition in the Shipment document to determine a new actual route. Looks like the shipping condition has a role to play in the route determination only in the Delivery doc and not in Shipment doc. If that is the case, any idea why the Shipping condition field is made available in the shipment doc and what its being used for ?

Ver SAP ECC 6.0

Thanks,

Anand