Ground transportation, then?

Ella nodded and focused her attention on that particular area of transportation. She'd driven once, actually. It had been interesting, that was for sure. Maybe she'd give it another go in the summer. Maybe.

The eighteen year old was inclined to mention walking as the earliest form of transportation but then she had another thought and her hand went up. "Horses, Professor? I mean, people were able to get places quicker riding on horses than, say, walking a large distance."