If you have stopped your vehicle on an expressway due to a breakdown, must you switch on your emergency lights, and if the vehicle is not so equipped, your position lights?

Yes, this is an obligation arising from Art. 50 para. 2 of the Road Traffic Act. In the event of an emergency stop on an expressway, you must switch on the hazard warning lights or, if these are not available, the position lights. It is also mandatory to place a reflective warning triangle 100 m behind the vehicle, which is crucial for safety on a high-speed road.