No idea what the law is like over there, but here you are obligated to place a warning triangle some distance out and every car must carry a kit that among first-aid stuff has such a triangle.
Not sure if I'd try that stuck on the left lane of the freeway (or Autobahn).
Which is consistent with his story since he claimed the hazards went out "While the tow truck was setting up to load the Tesla" which was a 15 minute process.
It goes to show, even with advanced technology, low-tech items like road flares can be life savers.