Superelevation on a 3 Lane road with Conc. Barrier @ Center and Inside Shoulders

[Anonymous]

Hi Guys,

I have a unique situation, we are working on a roadway design which has 2 lanes in one direction and 1 lane in other.

I have created a template for this but when I am trying to super elevate this template.

I don't see an option for  a 3 lane road under the superelevation specifications.

I would really appreciate if someone can throw some light at this.

Thanks Guys,

Shash

[sboon]

Do the two lanes on one side have the same superelevation or are they different?  You should be able to use two copies of the LaneOutsideSuper sub, and they will both reference the same superelevation value, calculated from the alignment properties at each station.  You could also use the inside lane superelevation parameter for one lane and the outside lane parameter for the other.

[Anonymous]

Hi SBoon,

Thank You very much for the reply and yes I do have 2 different slopes on my 2 lanes. I have 1.5% on inside lane and 2% on outside lane.

I am attaching a PDF of the template I am using to give u guys better Idea of What I am talking.

I would really appreciate help in this matter.

Thanks

Shash

[Jason.Hickey]

Hi Shash,

Have you looked at the LaneBrokenBack subassembly? This looks like what you'll need for one side of your roadway (the two lane side.) It allows you to use superelevation and use different slopes for both lanes. From the help file:

This subassembly creates a set of inside lanes and outside lanes that may have different slopes. The inside lanes are inserted outwards from the attachment point using the Inside Lane superelevation slope. If the superelevation is not defined at a station, the Inside Default %Slope value is used. The outside lanes are inserted outward from the end of the inside lanes, using the outside lane superelevation slope, or the Outside Default %Slope.

I hope this helps!

[Anonymous]

Hi Mr. Jason Hickey,

Thank You for your reply I just created a template with the LaneBrokenBack but that didnt help me.

Cna you think of anything else. And when I am in my 'superelevation specification', section under 'Transition lenght Table'. There are options only for "2 Lane "& 4 Lane". How can I change that to 3 lane?

Thnak You

Shash 

[Jason.Hickey]

I just received your case via your reseller. I am looking into the issue now. 

[MMorrison]

And the answer is?

[onsionsi1]

Hi Jason.

Did you get the solution for this issue.

We will be appreciate for your help.

Thank you.

[peterfunkautodesk]

In this case, I would use superelevation for a 4 lane road but make the subassembly only use 3 of the lanes.

Peter Funk

Autodesk, Inc.

[onsionsi1]

You can't use 4 lane because there is a different slope for thes 3 lanes.

Thank you in advance.

[peterfunkautodesk]

The four lane super elevation will produce 2 lane slopes in both directions (4 lanes) but you only will use 3. Why doesn't that work?

Regards,

Peter Funk

Autodesk, Inc.

[onsionsi1]

Yes i'm accept with you The four lane super elevation will produce 2 lane slopes but our issue here that there is two different slope rete for one side.

Thank you.

[peterfunkautodesk]

Are you saying that the inside lane might superelevate to 4% but the outside lane might go to 8%? If that is the case I can see a few different ways to do it, but this is NOT something that Civil 3D was designed to do.

1. Enter or override the superelevation values for the alignments

2. Import the values from a spreadsheet

A few drawings might help show what you are trying to do.

Regards,

Peter Funk

Autodesk, Inc.