In the following video we show you how to model subgrades for roads using the Slope Slope instruction type in the corridor template editor. The slope slope instruction allows you to compute the point at which two slopes intersect e.g. the subgrade surface and the foreslope of the finished grade to compute the extended subgrade out to finished grade. By using the node to node method of slope input, you can also match the slope of the subgrade to that of the finished grade pavement surface as needed as well ass to a variable foreslope slope if necessary
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