S: (n) skibob (a vehicle resembling a bicycle but having skis instead of wheels; the rider wears short skis for balancing)
S: (n) sled, sledge, sleigh (a vehicle mounted on runners and pulled by horses or dogs; for transportation over snow)
S: (n) steamroller, road roller (vehicle equipped with heavy wide smooth rollers for compacting roads and pavements)
S: (n) wheeled vehicle (a vehicle that moves on wheels and usually has a container for transporting things or people) "the oldest known wheeled vehicles were found in Sumer and Syria and date from around 3500 BC"