Add "Truck has cannot unload for xx minutes" alert message

Please add a message informing when a truck has been stuck without a place to offload its cargo. I frequently run into this when I have landscaping projects and 50 trucks show up fully loaded with dirt when I only needed 1 or 2 (see other suggestion "allocate/partition dumping sites like storage" for details on this scenario). I then end up with a ton a trucks just sitting around doing nothing because they can't offload and it's only when I move around the map that I see them and have to unity empty them.

Not sure the exact/best form such a message would take but having something would help with at least being aware of when it occurs.

At one point, I thought vehicles were supposed to go offload into the shipyard in cases like this (which would alleviate the main problem), but mine don't for dumpable stuff. Not sure if that is an issue or by design, but that's outside the scope of this suggestion.