Vehicles

1. air

1.1. aeroplane

1.2. helicopter

1.3. spaceship

2. water

2.1. boat

2.2. submarine

2.3. yacht

2.4. canoe

2.5. kayak

3. ground

3.1. car

3.2. taxi

3.3. tram

3.4. train

3.5. motorbike

3.6. bicycle

3.7. bus

3.8. trolley bus

3.9. truck

3.10. subway