Most people are probably not aware of what that even means. In the north when the sun shines, it is so bright that we can lose our vision as the sun reflects off the white surface of the snow. But there is also a problem when it is cloudy that the contrast is just right, that it is nearly impossible to see the contours of the snow.
As a result, it is almost impossible to see the road and I've witnessed many people literally venture off into the ditch because they could not see where the road was. We have that same problem in our yard.
Can you see the drive way? Not really eh! The only hint that the road is there would be the gate and the trees. If I cut them out, you would be hard pressed to see the road. That is how tough it is to see where you are going. We need contrast in order to see. Summer provides all kinds of contrast. But when everything is white, it gets really tough. Solution: Spread a little bit of used straw onto the road. Can you see the drive way now?