Intersection and Superelevation

[Joe-Bouza]

I'm not at my workstation but have this nagging thought: I have an alignment that calculates super  and I ended up with a 4-way intersection where full super ends at the intersection so I have to run out through the intersection.

1. will the Intersection wizard observed the SE?

2. If not what would be a recommended workflow

3. Is the more prudent approach the suggest a variance in design speed to change the super requirement?

[mathewkol · Accepted solution]

1. will the Intersection wizard observed the SE?

I wish!

2. If not what would be a recommended workflow

I like to export an ETW profile once the main road corridor is rebuilt and us it in the intersection wizard to control the ETW for the main lane and curb returns.

3. Is the more prudent approach the suggest a variance in design speed to change the super requirement?

Not sure.

[Neilw_05]

I've not had to deal with this scenario yet but it's good to know how to handle it.

I don't know if this is any better than Matt's solution but I'm thinking you could create a second corridor for the main roads that do not include the intersections. You would use a main road assembly that extends the lanes out beyond the intersections and create a suface from it. Since the lanes would honor the super parameters you would have a surface that you can sample as a guide for the curb return profiles.

Hey Autodesk, Bentley has this solved in their products.

[sboon]

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@Joe-Bouza wrote:

2. If not what would be a recommended workflow

3. Is the more prudent approach the suggest a variance in design speed to change the super requirement?

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2. I've posted about this previously, and it's a small part of the AU lecture I did last year.  In this case the minor road running left to right in the picture follows a relatively steep profile.  There wasn't enough room to completely match the crown of the major road running from bottom to the top of the picture.  What I did here was to start by building the major road corridor, with a region that includes the travel lanes only through the intersection.  I then added manual superelevation stations to the alignment so that the lanes transition to match the crossing profile then back to 2%  I then extracted the lane edge featurelines and used them as targets for the curb return regions of the corridor.

It's a little hard to see but the contours of the main road transition from crowned at the bottom of the screen up to match the high side on the right, then back down to a crowned road at the top of the picture.

3.  It may be prudent, but where's the fun in that? 

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

[Joe-Bouza]

All good tips - thanks. Let ya know on Monday how it goes

[Joe-Bouza]

I was nervous. It worked and the world didn't end <G>