Decided Id revisit the interior motion shots after a succesful first attempt.

this is the original: flickr.com/photos/dhodson/2452669079/

I feel this one is even stronger after removing headrests and adjusting the tripod position.

this was shot at 100 ISO, for wait for it... 15 seconds @ 30 mph. aperture was 8.0 didn't want to reduce the DOF too much.