Someone swept the snow off the bridge towards that grating - here the snow fell through the grating and piled up beneath. See how clean the path is in the middle - here the snow was swept away
Picture #8 answer is wrong. There is no frost on half the neighbor's lawn because they washed their driveway and watered the lawn. You can see the wet footpath too. They only did it on their property.
Someone swept the snow off the bridge towards that grating - here the snow fell through the grating and piled up beneath. See how clean the path is in the middle - here the snow was swept away