Button to search for an "idle worker"

Very often, after filling an area with soil (when the marked area is completely filled), dump trucks stop all over the map at gas stations, near docks, and in the filled-in areas...
They remain parked with an overflow icon until I locate them and unload them as a unit.
I'd like to be able to view all vehicles that aren't assigned to buildings and have stopped due to overflowing targets.
For example, in the F6 transport tab
Like at "press Z" in RTS