The Hum Rider is certainly some sort of publicity stunt, i can only imagine the road rage that would ensue for the people you drove over in that traffic jam. This thing appears to be based on a Jeep Grand Cherokee.
At the touch of a button the wheels extend out and then the entire SUV lifts 9-seet into the air. The wheels are wide enough to clear cars, at least smaller cars, in a traffic jam and then the SUV just cruises over the top of the cars out of traffic. The video shows a bunch of people with some flabbergasted looks on their faces.
I’d like a this tech on my car, no more traffic jams for me. Of course, if the reason for the jam is an accident further up the road you will be stuck. It doesn’t look like the setup can clear wide cars or trucks.