If you're involved in an accident on a motorway, are you obliged to signal the fact that your car is immobilized by placement of a warning triangle 100 m behind the car?

Why?

On a motorway, a vehicle stopped because of a breakdown or crash must be marked with a warning triangle 100 m behind it, and its hazard warning lights must be switched on. Place the triangle on the carriageway or shoulder, depending on where the vehicle has stopped. The photo shows a triangle behind the car, but the exact distance cannot be determined.

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