Is there a way in InRoads to create a reverse curve without having a tangent in between the curves?
Example, I am making a 400' (radius) curve that goes to the left and has a 400' (radius) curve that goes to the right with no tangent. It is making an "S" shape.
When I create this layout in MicroStation I can import the alignment by going File -> Import -> Geometry -> From Graphics and selecting the Horizontal Alignment from the drop menu. I use the "Check Integrity" of the alignment to make sure it is in right. But this is a hassle to do once the alignment is already created and you are making changes to it.
Once I have the alignment already loaded and try to make an "S" curve it gives me "Solution overlaps or contains discontinuities". If I make my curves have a 399.9' radius then it will work with a very small tangent in between, but I don't want any tangent I want an "S" shape. Any solution?? Hopefully that makes sense.
Hi,
You can use Multiple Horizontal Element Regression Analysis to acomplish this task. You may need to activate this tool from (Tools/ApplicationAdd-Ins). To create reverse curve select the first and the last tangent element and and add two curves between. Choose free parameters and enter 'first guess' values for curves lengths.Hit Apply and Inroads will compute curves for you. This is really powerfull tool.
good luck.
Adam
Best,
OpenRoads Designer 2023 | OpenRail Designer 2023
There is also the Horizontal Element Tools these tools give you full control over the elements allowing the creation of compound curves. Below is an explanation of some Geometry Layout Methods.
http://www.aot.state.vt.us/Caddhelp/DownLoad/CADedge/2008/InRoads%20Geometry%20Layout%20Methods.pdf
Mike LongstreetVermont Agency of TransportationCivil Engineering Technical SupportVTCAD Help