1. Draw the Roadway with Slab command as shown.
2. Use Polar Arrayed Lines to sub-divide the circular curve area.
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3. Pick on the Roadway created and choose the Sub-Element - Add New Points tool.
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4. Add nw points to the edges as shown.
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5. Modify the elevation of each points. Create a section through each edge lines will facilitate the proper changing of elevation.
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6. With each points properly elevated, you will get a nice roadway as shown.
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