I would say bring your camera, set your iso (2000 plus probably) way up, shoot in the highest speed "shutter priority" your lens will allow in the situation and give it a go. If nothing else you will get an idea of what your gear is capable of now, and maybe it will point you in the direction of a more suitable lens for this (possibly something like an 85mm f/1.8 or longer). I would also for the cars manually focus to an area the cars will be and go with that, more than likely the autofocus will hunt in lower light. Enjoy, you might be lucky and get some keepers