I have a Lexus RX300 w/standard roof rack; Yakima makes a bike carrier called the 'Raptor' that fits my rack w/their 'Mighty Mounts' (hate their names!). Yakima gear can be adapted to almost any factory-original rack with various parts and pieces. I bring my bike to work 2-3 times a week on top of my car - it's functional and simple - NOT inexpensive, though.