The dS value shows the ratio of the change in cross slope in relation to the difference in height between two slopes and the distance between these points. In the example, for a change in cross slope from 2% to 5% within 10 metres with a road width of 5.0m (see image below), the ds value would be 1,800.
The dQ value currently shows the difference in the change in cross slope. This means that if the cross slope in a road changes from 2% to 5% and the twisting section is 5 metres long, for example, the dQ value is 0.6. The dQ value does not take the width of the carriageway into account, which is what the ds value does.
The Country Kit converts the dQ value into the dS value, but if we draw a turning hammer, for example, the cross slope band is displayed incorrectly and the converted ds value is also incorrect. The problem is that the Country Kit takes the dQ value as the starting position and converts this into the ds value. However, this can only be correct if we have a simple road with parallel roadsides. As soon as we have a turning circle or a turn-in, the gradient remains the same, but we have a road width and therefore a greater difference in height.
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