1. A vehicle that has at least four wheels, with the rider sitting astride the vehicle and steering with handlebars.
  2. A vehicle that has at least four wheels and is steered with a wheel.
  3. A vehicle that has at least two wheels, with the rider sitting astride the vehicle and steering with handlebars.
  4. A vehicle that has at least four wheels and is steered with a wheel. The driver sits on it with both legs on one side of the seat.