Our city streets do not surface drain. In other words, we depend on a huge network of manholes and pipe to carry rainwater and melting snow away. The street sweeper is a critical part of that process. Winter sand, leaves and just plain old dirt and debris would clog that plumbing if not picked up first. In the spring when there is a lot of sand it is especially important to have the sweeper out. Public services are gradually reducing the “sand the snow on the road” method and replacing it with “soften the snow with salt and remove it” method. This will reduce the sand from being put out in the first place.