Actually had been going back and looking for a picture showing the front of the car before the accident. Thought maybe it appeared in a video. some of the conspiracy videos seem to show better or more extensive footage. Anyway in this non-conspiracy video the car seems to be shown before the incident at the 47 through 59 second mark of the video. Watching this again trying to answer your question I found something new. It looks like. The purple mini van appears at the 2:51 mark, just sitting there parked where it will eventually get hit by the two other cars behind it, the Challengerr knocking the other car into it. The street has very few people on it, compared to later when the incident takes place.
2:46-2:51 mark shows the purple minivan before the accident. There is no driver. It is parked on the street, in the middle of the street, but not sticking into the intersection.