this invention relates to a vehicle sun roof , preferably transparent or translucent such as glass or plastic , which contains the following characteristics : 1 . a frontal bar for aligning the sun roof cover which is an integral part of the cover frame ; 2 . hingeable means for raising , sealing and locking the cover when in a closed position , and conversely hingeably lowering the cover during opening ; 3 . means for moving the cover forward and rearward with a minimum of visibility by means of a separate rear crossmember ; the crossmember having slidable control cams attached at each end to control the upward movement of the cover rear edge ; 4 . a sun roof housing with a minimum loss of vehicle headroom ; 5 . a safety switch for shutting off the motor which is activated when an increased torque is exerted on a rotatable motor housing due to resistance to motion of the cover .