Is the vehicle driver obliged to signal the stop of a motor vehicle or trailer due to damage or an accident on the expressway?

Yes, signalling a stationary vehicle due to a breakdown or accident on an expressway is absolutely mandatory. According to Art. 50 para. 2 of the Road Traffic Act, you must switch on the hazard warning lights and place a warning triangle 100 m behind the vehicle. Correct marking is crucial for safety, as vehicles travel at high speeds on expressways.