Abstract: The invention, a device and method to prevent an automobile with an object on the roof rack from entering a garage, has three main components. The first component is the detector. It is mounted on a roof style bike rack. When a bicycle is mounted on the rack, it activates a switch on the detector, causing the detector to emit a radio signal. The second unit is the proximity transmitter. It is mounted on or near the garage door. The proximity transmitter emits a continuous signal. The third unit is the base unit. It is mounted inside the automobile. When the base unit detects a signal from both the detector and the proximity transmitter, it emits an audible and/or visual alarm that warns the driver he is approaching his home garage and there is a bicycle on top of the car.