Are you obliged to maintain a distance of at least 1 metre from the overtaken cyclist in this situation?

Yes, when overtaking a cyclist, the driver is obliged to maintain a distance of no less than 1 metre. This is a requirement explicitly stated in the regulations (Art. 24 para. 2 of the Road Traffic Act). Maintaining a safe distance is crucial for the safety of the cyclist, who is a vulnerable road user, sensitive, for example, to the gust of air created by the overtaking vehicle.