I still think there's something odd about this.
The white van in the bottom left appears to do a sharp brake as though the lights have only just come on. Even if they haven't and assuming they weren't on when the green lorry crossed the same line, there only 7 seconds between the back of the green lorry crossing the stop line, and the barriers starting to lower. If they only came on as the white van approached, that's only 4 seconds.
At a faster speed, albeit hitting the barrier on the way, the lorry that destroyed the gate takes 7 seconds between the front of the cab passing its stop line, and it clearing the rail line.
From the video only, one has to conclude that the time between the orange lights illuminating and the barriers starting to close is the same time as it takes a large vehicle to cross the entire crossing, at speed. And that isn't enough.