Something very useful in MicroStation and AutoCAD is the ability to define an arc by 3 tangent points. The elements could be of any type and each point would belong to a different element.
| Civil Product Used | OpenSite Designer, OpenRoads Designer, OpenRail Designer |
civil arc by 3 points does not accept tangential snap for through-point
Placing an arc Start, end, middle with "Tangent Snap" accomplishes this.