What information can you get from plough markers when there is a lot of snow on the road?

When there is a lot of snow on the road, it can be very difficult to see road markings. When this is the case you have to rely on ploughing.

Once a road is ploughed, keep in mind that the plough truck may have cleared an area that is wider than the carriageway. To avoid driving outside of the carriageway and potentially skidding off the road, you must not drive too close to plough markers as they are located close to the edge of the ditch.