Transportation

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Across
  1. 3. A narrow board mounted on four small wheels, driven by pushing with one foot.
  2. 4. A four-wheeled motor vehicle used for personal passenger transportation.
Down
  1. 1. A winged aircraft that flies through the air carrying passengers or cargo.
  2. 2. A two-wheeled motor vehicle powered by an engine.
  3. 3. An underground electric railway system used in large cities.