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?

Yes, in the event of a vehicle breakdown on a motorway or expressway, a warning triangle must be placed 100 m behind the vehicle. According to Art. 50 para. 2 of the Road Traffic Act, it is also mandatory to switch on the hazard warning lights (or position lights if the vehicle is not equipped with them). The significant distance for placing the triangle is crucial because it gives other drivers travelling at high speeds time to react safely.