Wintertime vehicle can refer to a SLED, which is a four-letter word. A SLED is a vehicle that is typically used in the wintertime, usually for recreational purposes such as sledding or snow tubing. It is a flat bottomed vehicle that is designed to slide over snow and ice, and is often pulled by horses or dogs. Sleds are also used for transportation in some parts of the world, such as in rural areas of Canada and Alaska.