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Across
  1. 2. Extremely small vehicle using the Greek prefix for a millionth part.
  2. 4. Open-top two-seater named with a suffix denoting a person or thing associated with the highway.
  3. 9. Speed-increasing pedal combining the Latin prefix ad- ("to" or "toward") with the root for "swift" and an agent suffix.
  4. 11. High-performance vehicle using a Latin prefix meaning "above" or "beyond".
  5. 14. Self-moving vehicle category from Greek auto- and Latin motivus.
  6. 15. Engine RPM gauge using the Greek root takhos for "speed".
  7. 17. Rapid-motion gauge combining an Old English root for "success/haste" with a Greek measuring tool.
  8. 18. Premature fuel burning in a cylinder, using a Latin prefix for "before".
Down
  1. 1. Engine compressor driven by a turbine, combining a spinning Greek root with a loader.
  2. 3. Transformable roof vehicle using a Latin suffix for "ability" (Note, corrected spelling from "convertible").
  3. 5. Vehicle sized below the closely packed standard, using a Latin prefix for "under".
  4. 6. Device that removes ice, using a Latin prefix for "reversal" or "removal".
  5. 7. Small cargo carrier combining a shortened "miniature" with a covered vehicle.
  6. 8. Distance-traveled recorder using the Greek root hodos for "way" or "journey".
  7. 10. Self-governing vehicle technology named from the Greek root for "law" or "custom".
  8. 12. Self-operating guidance system combining a Greek prefix for "self" with a steering specialist.
  9. 13. Engine compressor driven directly by the engine, using a Latin prefix for "above".
  10. 16. Top-tier performance vehicle using a Greek prefix meaning "over" or "excessive".