Going from the side... does it really matter if there's a car there?
Really?
You still have to clear the car to land safely. One dunker in the semifinals jumped over 3 motorcycles, but caught his foot on the handlebar of the final bike and fell when he landed. He was okay, but it could have been worse. So yes, it definitely matters.
It was also much more impressive than Griffin's because he jumped over the cabin, not the hood. He nearly cleared the entire width of the lane on that dunk, somewhere around 14-16 feet (depending on if it's regulation).