Driving on highways

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Across
  1. 1. the act of combining with other cars on a highway
  2. 3. the E part of the IPDE process
  3. 5. the D part of the IPDE process
  4. 7. the I part of the IPDE process
  5. 8. the type of highway made for speed with limited entrance and exit points
  6. 10. the first highway system that connected states
  7. 11. the place on a Controlled-Access highway where you enter
Down
  1. 2. the most effective highway system with an east and west running number system
  2. 4. the lane where you speed up before entering a highway
  3. 6. the P part of the IPDE process
  4. 9. a network of roads inside a state