Went into the town to buy some cat litter (heavy). I managed to get it on the buggy, and was careful to avoid any problems with the snow until I came to a slope. Then I got stuck on a slippery surface. Couldn't go forward so turned off the buggy which started to slide backwards. No panic. Two nice motorists stopped, turned the buggy round and guided me through a busy road. There are such good helpful people around.