This quick clip is truly a truck driver nightmare.
You can bet that I will always try to double check that the shipper has secured the load before pulling from the dock to close my doors.
This might seem simplistic, but actually it is not.
Often, we back into a dock that has a red/green light visible to the driver in their side mirror.
After the driver backs in and sets the trailer brakes, a mechanical "grabber" reaches out from the dock and basically secures the trailer to the loading dock so that a "brow" can be deployed to bridge the gap between trailer and dock. At this point, the light will turn RED indicating that the driver cannot move the truck/trailer away from the dock. The "brow" enables the forklifts to whiz in and out of the trailer either loading or unloading.
As you can see by the black outline around the opening there at the dock in the video, the trailer has backed up INTO a sleeve that seals the trailer to the loading dock.
In other words, the driver can't actually see into the dock to either make sure that the load has been secured or communicate with the dock hands.
Ideally, when the loading is finished and the load has been secured, the "brow" will be lifted and the light will turn GREEN. Upon seeing a green light, the driver pulls away from the dock and adjacent trailers to be able to close and lock the doors of the trailer.
The first time I saw this, I sat with my mouth open in horror.
The second time I saw it, I laughed until I cried.
It is still funny.