When we search for images, we go by what we naturally think is apparent; If we can't confirm for sure whether that is a person or not, then we can't assume. Tag what you see, not what you *think* you see.
You just assume that it's a prop when the more logical way to think is that there is a person inside the car. You see a helmet so a person wears it.
You are making here something up that isn't correct. You assume that she is alone in this image while we can clearly see the presence of another person. You assuming that makes much less sense.
If it's somewhat ambiguous if the character is or isn't alone in the image, you should probably default to solo_focus instead of using solo. The solo_focus tag in many ways is also a filter for the solo tag to make it only represent images without anyone else present. The solo_focus tag in general took over the gray areas that used to exist under the solo tag, allowing for the solo tag to be more cut and dried on what falls under it.
My personal impression of the image is that the car was moving, though that's cause of Kashima's flag moving giving a sense of the presence of wind which that would make me think the car is moving. The confetti and flag would also give the impression of the car crossing the finishing the line, and the lights being on and wipers up would also give a sense that the car is being operated. Of course none of that truly indicates the car is being operated, or that the car really is moving. This could just as likely be a photo shoot, which would make sense given how close Kashima is to the car. Anyways, general lack of info truly indicating one way or the other that there truly is a person in the car.