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Corridor template side slope transitioning issue

  • 1.  Corridor template side slope transitioning issue

    Posted 01-25-2019 08:20
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    I am experiencing odd behavior with side slope transitions throughout a corridor model.  The roadway cross slopes work with the super-elevation transitions but when I add a side slope tie in at the edge of the template-either 2:1 of 3:1 cut or fill-the instructions lead to a sudden and abrupt edge in the surface.  See the attached photo.  Curious to know if other have run into this in the past and what the solution might be. 

  • 2.  Re: Corridor template side slope transitioning issue

    Posted 01-25-2019 20:17

    Are you using Tables with the Sideslope or just a straight sideslope instruction along the length of the corridor? Also are you using a single Template or multiple templates in the corridor.


    This could be a Template Transition thing (where one Template says to do one thing and another Template says to do something different so the software tries to morph between the two states - that is the first possibility.


    The second possibility is that the sideslope computes at the Computation Interval and at critical points along the road - if at one station it says it is a Cut of 3:1 and the next interval a Fill of 3:1 you will get a transition from one to the other over the computation Interval - this can also be triggered these days by elements prior to the sideslope defined by 2D lines for offset or tables for offset - if you have two nodes very close to each other in the tables, then this will also reflect in the sideslope and if you happen to hit a Cut to Fill transition you could see what you are seeing here.


    Failing all of that - I would have to see the model to be able to give you a definitive answer to the question - you can email me at if you don't want to share it publicly and I wiull take a look next week for you.


    Try changing your computation Interval, try setting densification to Yes on the Corridor Surface Model, take a good look at the instructions and table / line controls at that specific station, and take a good look at the templates defined around that area -that is where I would most likely start - it is hard to tell from the image exactly what is happening at that spot and if it is occurring over a very short distance or a longer distance


    If you do share the model - please draw a circle at the station or send me the station and side of the road where the issue is occurring so that I can find it quickly





  • 3.  Re: Corridor template side slope transitioning issue

    Posted 01-30-2019 16:04

    Alan, thanks for the response.  I appreciate the effort. Unfortunately, I have since deleted the slope information from the model to complete the finish grade road surface only. 


    I have moved to using a single template and tables...this is producing better-more predictable results. 


    I will be sure to post again if I have issues when I revisit the slopes.


    Again, thanks.