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We often have ditches in roadway cross sections. I create a feature line to model the bottom of the ditch, so that there's a target for the slope into the ditch. My question is, is there any way to specify a point by providing a station and an offset off the road alignment, so that I can place the feature line nodes accurately? What I've been doing is 1) draw a series of circles centered on where the sample lines cross the centerline; 2) draw the feature line with each vertex at the intersection of a circle and a sample line; 3) provide the elevation based on the elevation needed in the cross section. Yes, it would be more efficient to draw one long segment and let AutoCAD extrapolate the elevations, but our ditches never line up that neatly. A better question might be, is there a more efficient way to create a ditch in cross sections? Up until now, we've been doing all this by hand. Judging by the lack of discussion on this particular item, it's so easy nobody has problems, or they're doing it manually too.

Hello. I was wondering if this is even possible to do with LISP. So this is what I need - I need a Lisp that would create cross section for ditch. I would like to type in existing ground and ditch marks, then existing width of the ditch and existing bottom width of the ditch. After that I would like to create a designed ditch cross section, by entering the same parameters + slope must be 1 : 1.5. (Also, both, existing and designed ditch bottom centers must align.) For background I would need frame that You can see in added file. For me all this sounds unreal, but if there is someone that can produce something like this I would be really thankful. x section.dwg