If you find yourself driving against the flow of traffic on a motorway, it is prohibited to turn in the opposite direction. In such a case, you must:

  1. stop as near as possible to the edge of the road
  2. switch on your hazard lights
  3. put on a reflecting vest
  4. place a warning triangle at a distance of 100 m in front of the vehicle
  5. call the Police at 158 and report the situation

Watch the video of a real situation: https://transit.tir.cz/wp-content/uploads/2019/09/VF190829_175620_flv_middle_jda.mp4

You can now see the following traffic sign at entrances to Czech roads: Stop – oncoming lane.