A Narrow Pass connects the Main Zone with a Sub Zone. For passages greater than 2m (6.5 ft), the mower will be able to drive through.
When a narrow pass is between 1-2m (3-6ft), the wires should be installed in the middle of the path with RoboRuler distance 1 between them, to allow the mower to be able to follow the wires in and out of the sub zone. On the entrance to the path from both directions, you should break the corner to 45 degrees so the mower will turn accurately in and out the narrow pass.