Road layout - Vertical Curves - Bezier curve a Parabolic Curve?

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Does anyone know whether a bezier curve is a parabolic curve? Also, has anyone used VectorWorks to lay out vertical curves?

Your question may be restated as can a Bezier curve become a parabolic curve and the answere is yes.

What do you mean by "Lay out vertical curves" ?

What I mean by laying out a vertical curve, is starting with the PVI and bisecting the length (L)of the curve in equal distances to both the PVT and PVC, and then calculating the vertical offsets (d) from the incoming tangent through the length of the curve to establish the vertical curve centerline elevations.

If I use VectorWorks to create a Bezier curve with the starting point at the PVC and the end point at the PVT, will the offset elevations equal the parabolic curve elevations as would be calucated above?

In summary, we are looking for a way to use VectorWorks for engineered road alignment as an alternative to Autodesk's LDD.

We really appreciate it.

neonpainter

This one feature I have asked for also. That and dynamic cross sections for roadway work

In his recent Architosh interview the NNA CEO indicated that VW is unlikely to be developed for Civil Engineering. http://www.architosh.com/features/2005/features/interviews/sean/0505-interv-1.html

If you want Mac programs for road design look at the following:

- HighRoad from Creative Engineering http://www.createng.com.au/products.htm

- SimuTerra from Compuneering http://www.compuneering.com/

Roadway design is not necessarily a civil engineering function. I layout roads and parking lots for almost everyone of my projects. I think LA's have a better feel for site planning than civil engineer's as a whole. (no offense islandmon)Once I have laid out the road system including alignment, grades, elevations, etc., than I will turn the road system over to the civil's for engineering. Many of these issues are necessary to validate preliminary planning and design.

VW has acquired in the past DTM software from Compuneering but did not implemented from a real world perspective or usage by civil engineers and earth moving contractors.

I dont see why VW seeing the HUGE success \$\$\$\$ of Autocad Land Desktop module can do better?

Certainly HighRoad beats any other software designing and laying out roads, channels, breakwaters, excavation and any other related earth works, for WINDOWS or MAC plataforms! An you can use UTM or State Plane coordinates for stake outs (no scale adjusment yet but Chris is working on it!) So dont lose time and get it

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