I always travel with my bike (2008 Cannondale Team Liquigas w/ Campy Record) in the rear seat standing upright with the wheels off of course. The bike sits on some old cardboard box pice so the chainrings do not go through the seats and the bike is held in by the seatbelts. I try not to let the bike lay flat because the shaking and bumps while travelling there affects the shifting after a while as well as the possibility of damage to the rear derailleur. The wheels I place behind the seats in the passenger foot space. Just my 2 cents worth. I used to do roofracks but the lack of decent mileage and the bugs and weather exposure drove me away from that route. Plus this way my bike is alwayslocked up and secure.