Please refer to the following additional Webinar and Written Blog for additional information on this topic.
Following on from a webinar I presented recently (during which I failed to get the superelevation to behave as expected) this video looks at the superelevation of elevated crowned highway using a marked point assembly for the median.
Undivided crowned highway superelevation is assigned according to the alignment that the base point of the assembly is defined on. Hence it is a close approximation to the central line alignment of the left and right groups. If you wanted to have an exact super elevation applied then you would have to use the central line alignments of the left and the right grouping instead (and therefore there would be two separate corridors).
In this video, we show the South African standards being applied to the superelevation. The curves (corners) are used for super elevation. Each curve has its own unique number which is assigned monotonically increasing from the beginning of the alignment. Each curve can be individually assigned to its properties, or the superelevation wizard might be used to define the properties for selected curves at once.
We also refer to the superelevation view where you can see how the different subassemblies are super elevated graphically as opposed to tabular fashion. Note you can switch individual save the same day alignments on and off to view them individually and that there is even a style where you can set the color of the superelevation graph. Being able to refer to them individually also allows you to adjust them graphically. If two of them are switched on and they are superimposed then you would be graphically altering both at the same time and so it is important to be able to isolate them when needed.
After I’ve finished with the case study on this road, I concluded that’s using divided roads to apply super innovation might not always be the most relevant method to follow, and at least in this case that individual central line alignments would be more appropriate. This would be due to accuracy and in marginal cases might make the difference between Driver having an accident will not.
Of course, for other situations Superelevation according to the median alignment would be totally appropriate. Relatively flat roads running parallel for long stretches at a time not too far apart perhaps representing a main artery to a city or a town or bypass would be appropriate candidates.
For detailed instruction on how to put the divided ground Rd. together please consult this written blog and this webinar.
If you need help adopting the AEC Collection or the Autodesk Construction Cloud in your practice or you are looking to invest in hardware, please contact Micrographics so that we may be of assistance.
