Gradual transition of cross slope in corridor

[jakob_holmquist]

Hi! Civil 3D beginner here, sorry if this is a dumb question.

I'm designing a road the connects to an existing road. The cross slope of the new road needs to match the longitudinal slope of the existing road's right edge of pavement at station 0+000, and I want the cross slope of my new road to gradually change to a certain value. So for example, on the right side of the road the beginning cross slope is 2%, and 30 meters ahead I want the cross slope to be -3% and it should remain -3% for the rest of the corridor. How is this done in an easy way? 

I created a feature line for the existing roads right edge of pavement and got elevations from the existing ground, so I have the cross slopes at the starting station. So it's easy to have an assembly with the correct starting cross slope. But to have the cross slope gradually change to another value is where I'm failing. 

Superelevation is something I have tried, but couldn't understand how to make it work (since the part of the road I want to change the cross slope includes a straight line, a curve and another straight line).

I tried connected aligments but couldn't modify over what distance the gradual slope should change.

I tried creating two asseblies with different cross slopes but then the corridor would get a sharp edge where 2% turned into 3% all of a sudden.

[jakob_holmquist]

Hi! Civil 3D beginner here, sorry if this is a dumb question.

I'm designing a road the connects to an existing road. The cross slope of the new road needs to match the longitudinal slope of the existing road's right edge of pavement at station 0+000, and I want the cross slope of my new road to gradually change to a certain value. So for example, on the right side of the road the beginning cross slope is 2%, and 30 meters ahead I want the cross slope to be -3% and it should remain -3% for the rest of the corridor. How is this done in an easy way? 

I created a feature line for the existing roads right edge of pavement and got elevations from the existing ground, so I have the cross slopes at the starting station. So it's easy to have an assembly with the correct starting cross slope. But to have the cross slope gradually change to another value is where I'm failing. 

Superelevation is something I have tried, but couldn't understand how to make it work (since the part of the road I want to change the cross slope includes a straight line, a curve and another straight line).

I tried connected aligments but couldn't modify over what distance the gradual slope should change.

I tried creating two asseblies with different cross slopes but then the corridor would get a sharp edge where 2% turned into 3% all of a sudden.

[Joe-Bouza]

SE can be a challenge but can be forced to do it (so I hear)

you can profile the eop to transition 

[Joe-Bouza]

SE can be a challenge but can be forced to do it (so I hear)

you can profile the eop to transition 

[samir_rezk]

Hi @jakob_holmquist 

@tcorey has a great Guide for designing Corridor intersections. The link will walk you through the principles for modelling a planner intersection (where the Target is the Centerline of the Main road) in your case you will need to target the Feature Line (or EOP Surface Profile) of the Main Road EOP (the tie in elevations) this is referred to as a Crowned Intersection. you can use Feature Lines or Alignments for the curb returns. In recent releases, the Connected Alignments feature will make the model more dynamic, but same principles apply. The trick is to design the intersection from the outside in (Curb Returns to Centerline! that is reversed from typical engineering practices where we design from the Centerline out!)

Hope this helps,

[samir_rezk]

Hi @jakob_holmquist 

@tcorey has a great Guide for designing Corridor intersections. The link will walk you through the principles for modelling a planner intersection (where the Target is the Centerline of the Main road) in your case you will need to target the Feature Line (or EOP Surface Profile) of the Main Road EOP (the tie in elevations) this is referred to as a Crowned Intersection. you can use Feature Lines or Alignments for the curb returns. In recent releases, the Connected Alignments feature will make the model more dynamic, but same principles apply. The trick is to design the intersection from the outside in (Curb Returns to Centerline! that is reversed from typical engineering practices where we design from the Centerline out!)

Hope this helps,