Horizontal alignment in road design

[aaishzayed]

Dear sir,

I would like to know what is the easy way of making widening of horizontal curves .
thank you for helping.





aaish

[sinc]

Are you saying you have a roadway that is widening as it goes around a curve?

The way to handle that is by attaching transition lines to your template. I don't know if you'd exactly call it easy ... I suppose it really isn't very hard, but you have a lot of options, and a lot of settings that all have to be set right.

How familiar are you with alignments and cross-sections? If you're already pretty familiar with using them for simple stuff, do a search on "transition lines" in the help. If you're completely new to alignments and cross-sections, it's a little intimidating at first. Once you do it a few times, it's not too bad, though.

If you're brand-new to alignments, this is the sort of thing it's easiest to have someone guide you through. If you have instant messaging capabilities, I know Mike Farrell frequently offers to use this capability to step people through procedures like this. He'd most likely be willing to guide you through the process if you ask... (note how willing I am to offer up others' time... )

[tscheevel]

There is a tutorial on dynamic templates on the Autodesk website that may be helpful.
Here is the link:
http://usa.autodesk.com/adsk/servlet...linkID=2475360

[mjfarrell]

Right, you are Richard, I am always willing to help.

From what I am reading, this user will need to define a
sub-grade template (based on super elevation of the curve)

The user will need to edit that template and ensure his outer alignments
that will follow the widening alignments (transition alignments R1 & L1)
They will need to be Dyana and Free or the results will not be as expected.
Also proper definition of the super-elevation region will be required.
If not using the super-elevation parameters in design control, then additional
Transition vertical alignments will need to be defined to 'force' the super-elevation
through the cure.