Impossible Puzzle about Travelling transports

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Across
  1. 3. bicycle but it has an engine instead of your legs
  2. 4. transport that works with you moving your legs, it has 2 wheels
  3. 7. a plank with 4 wheels, you can stand on and by pushing with your leg off the ground move
  4. 10. Very big yacht, where you travel with other people
  5. 11. most basic land vehicle
  6. 12. a public car that can fit a lot of people
  7. 13. underground train
  8. 14. you using your legs to travel
Down
  1. 1. You can travel to space with this
  2. 2. transport which is used to "swim" in the sky
  3. 5. air transport that has a blade that spins
  4. 6. Rich peoples boat
  5. 8. boat that can transfer you from land to land with your car
  6. 9. You are the water transport yourself
  7. 12. Most basic water transport