2011 Toyota Prius Navigation Manual - Page 235

ADVANCED PARKING GUIDANCE SYSTEM There may be times when, due to image distortion, the green frame does not match the parking space lines on the road surface. In this case, attempt an approximate match in an area where the warning flag does not overlap with any parked vehicles or obstacles. You may adjust the target parking position even after starting the parking assist mode. CAUTION D Always check that there are no obstacles in the green frame or between your vehicle and the parking space, and that the warning flag does not overlap any parked vehicles or walls. D If there are obstacles in the green frame or between your vehicle and the parking space, or the warning flag overlaps a parked vehicle or wall, there is a danger of collision. In this case, do not use the parking assist mode. D The warning flag is only a guide. Be sure to directly check your surroundings and behind the vehicle for safety, and back up carefully. D If the road surface has level variations or a gradient between the starting position and target parking position, it will not be possible to correctly set the location, which may cause the parking position to be misaligned or crooked. In this case, do not use the parking assist mode. 237