A responsible guide can help you by watching the area into which you are backing and by keeping an eye on your blind-spot zone. The guide should stand in a position to see you and the area to the rear of your vehicle clearly. They should also be prepared to warn you if pedestrians or vehicles move into your path as you back. This can help you make an easy and safe approach to the dock. Remember that back-up alarm devices do not relieve the driver’s responsibility when reversing.