I was traveling westbound on i-270 in worthington, ohio from westerville when i saw a silver spherical object traveling north. it was low on the horizon following a straight line descent. at first i thought it was miles away but as it descended, it crossed in front of worthington industries and that's when i realized it was much closer to me than i had initially thought. my wife was in the passenger seat although she did not see it. i asked her to look as we passed the area to see if she could see anyone flying a remotely controlled drone. she did not see anyone. i drove through the complex of buildings later in the day to see if there was a public park there where someone might fly remotely controlled craft and observed that the area was fenced off with no public admittance.