Width Target Assembly Stretching [ stupid question ]

[rendarin]

Hi guys,

I have a stupid question about width targets; I was pretty sure I had seen this in the help but for some reason I couldn't find it again.

Let's say I have an assembly called Original, as shown below with a 6m wide lane. Now I want to target it to 8m wide for some road widening. Now, will it stretch along the slope of the subassembly (Case 1) until 8m width, or will it just shift laterally to 8m (Case 2)?

I know that we can set the default slope of it, but I'm not sure if it gets overriden due to the Target-width process.

Thanks mucho 🙂

[t_mckenzie · Accepted solution]

It depends on what you tell the subassembly to hold. The basic lane transition has options to; "Hold offset and elevation", "Hold elevation, change offset", "Hold grade, change offset", "Hold offset, change elevation", and "Change offset and elevation"

If you don't set targets when you tell it to change something (offset, elevation or grade) then it will use the default.

Hope this helps,

-Tucker McKenzie

[ericcollins6932]

The way I figured it out was to use offset alignments. Offset your CL alignment your default 6 m on either side and you will have one centerline and two offset alignments. Click the offset alignment you want to add the widening and click add widening. The widening amount is from centerline so 8 m in your case. You can set up transition length and style (curve-line-curve or linear) however you like. Then use the transitional subassembly and set its targets to the left and right offset alignments and it will auto widen following the alignments. This keeps it dynamic. You can also use feature lines, but if you use alignments and shift the CL, your offset alignments and corridor will dynamically update.

[rendarin]

Ahh, I see my problem. We have been using the LaneSuperElevationAOR subassembly here in the office for lanes, as it also automatically includes the sub-base and base-course layers, and LaneSuperElevationAOR doesn't have that option.

I could switch the subassembly type to BasicLaneTransition, but I've been planning on using the different layers of LaneSuperElevationAOR to compute the volume of materials needed.

However thank you very much for that insight, I was so entrenched in using that one type of subassmebly I hadn't considered the others.

[rendarin]

Hi Eric,

Thanks for that input, I've been using polylines quite a bit to often for widening roads; I hadn't really used the Widening feature before so I had totally overlooked it. thanks

[rendarin · Accepted solution]

Hey guys, thanks everybody for their time.

However I did what I should have done before (don't know why I didn't think of it) and just went ahead and modelled it in C3D.

Apparently when using the LaneSuperelavationAOR subassembly, the default is Case 1 when there is a width target (without a profile target).