This is especially helpful for matching grades at a specific point along a point in your design profile. Some of our favorite include the ability to create an entity-based free circular or parabolic vertical curve by selecting a pass through point. When creating design profiles using the Profile Layout Tools you now have several additional tools to choose from. Similar to the Mid-Ordinate options previously available for Feature Lines, Corridors now give you the ability to sample curves based on a Mid-Ordinate distance instead of a one-size-fits-all sampling frequency available in previous releases. The sampling frequency for one curve is rarely the best frequency for all curves within your corridor, especially if your alignment includes curves with both large and small radii. With Civil 3D 2015 your subassembly targets will be maintained even as you change the assembly for all or part of your corridor. In the past, changing assemblies also meant resetting/redefining subassembly targets like those used for daylighting back to existing ground. Corridor modeling is typically a very iterative process that involves swapping out assemblies (typical sections), and refining the underlying horizontal alignment geometry.
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