Is switching on the emergency lights and placing a warning triangle at the distance of 50-70 m behind the vehicle the right way to indicate that it has broken-down on a motorway?

Why?

The video shows a warning triangle on the hard shoulder behind a stationary vehicle. On a motorway, you must switch on the hazard warning lights and place the triangle 100 m behind the vehicle. The distance of 50 to 70 m stated in the question is too short.

art. 50 ust. 2 pkt 1 Prawa o ruchu drogowym