The puzzled puzzle

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Across
  1. 2. lone tree on california rolling hills
  2. 5. country that sponsored columbus
  3. 6. transit backbone
  4. 9. vessel with sails
  5. 11. peninsula transit
  6. 14. maximal per capita emission producer
  7. 16. I do
  8. 17. clandestine car parking
  9. 18. wheeled active transit
  10. 19. passenger boat
  11. 20. only oil producing city in the SF bay
Down
  1. 1. colorful weather phenomena
  2. 3. underfunded train system
  3. 4. cars joined together
  4. 7. housing that should be built
  5. 8. secret agents or overnight train
  6. 10. boot country
  7. 12. western spanish colony
  8. 13. god's mother
  9. 15. imaginary winged fae
  10. 16. jolly
  11. 18. mediocre alternative president