then they should clearly understand why its important to not hold up trucks for hours (sometimes days) on end (so the next DC delivery the driver does is not late, causing another fine), and, should be receptive to paying detention, which they rarely are willing. If the fines are meant as a deterrent, and, not a revenue stream, they should willingly pay out from their "Fine Account" when they are guilty of the same. What you say is what is offered for the reasoning by any DC, but, it is clearly meant as a revenue generating "deterrent".The supply chain is mainly about planning on time. A small warehouse can receive 100 truckloads in a day, simply because it's shipping 90 out the same day. All 100 are coming by appointment, and all are going out by appointment. The workforce is aligned as well to load and offload. Now, just imagine if 30% are late on the incoming load without any notification, but 100% on time for the outgoing shipment. This will disrupt the supply chain, and much worse when you have a cold warehouse with lumpers involved.
So big players like Walmart and Target urge suppliers like brokers and carriers to follow their supply chain policies so everything is aligned and goes smoothly.
This is the reason, so strict on appointments and fines, so suppliers understand.