Vehicle on runners is a term used to describe a type of transportation that uses runners or skis instead of wheels. The most common examples are sleds, sledges and toboggans. Sleds are four-wheeled vehicles with a flat bottom and two curved runners, usually pulled by horses or dogs. Sledges are similar to sleds but have no wheels and are pulled by people or animals. Toboggans are long, narrow sleds with a flat bottom and two curved runners, usually pulled by people or animals.