How to create a simple racking system Step 03 Choose 15 racking bays. Each bay can also be changed manually. In the column Design you can choose to put a split, a cross road or a tunnel. In the column Data you then put how wide the split or cross aisle should be or the height to the first level in case of a tunnel. Note that the height should correspond to one of the beam heights specified on the former input form, and that the no of levevels must be reduced correspondingly. We now choose a cross road at bay 6 of 3 meter. This means that the cross road will be located between bay 5 and 6.