I agree. Road conditions during the winter aren't as bad as they were some decades ago, but we still get some spontaneous snowfall nobody expected, resulting in trucks and cars stuck on the autobahn for hours. We're just not used to drive with more than a few mm of snow on the road any more.This contraption will certainly not imrpove the situation.
Even in bright sunlight it may not be perfectly safe unless they assemble it as a single light-tight roof, otherwise it will be a nice strobe light for cars passing under it on a sunny day. The speed limit on this secition ssems to be 130km/h though. That's a circa 36Hz strobe for 1/3 of a second :-)
Just read your edit: I fortunately never was witness to someone flipping their car, but once had the opportunity to see the second next vehicle in front of me turn180 degress on the spot, in the middle of a 2-lane convoy headed for the CeBIT trade show, on just 10-20cm of fresh snow. A few seconds later blue emergency lights turned on some cars behind me, so we all moved on and let the police sort it out. I still can't imagine how the driver got their car to do this stunt.