How can I adjust the fillet settings of a Raised Median?

I'm trying to get rid of the fillet that is generated on the curb of a raised median. This is possible on a 'curb' lane type by setting the 'curb fillet' and 'gap fillet depth' to 0, but it seems a 'raised median' does not have these options.

Is there a way to accomplish this, or a workaround?

Thank you

Answer 1

[Sumukh]

Hi Terry,

The lane types “Curb” and “Raised Median” have different functional intent. The “Raised median” lane primarily serves as a barrier or separator between opposing traffic lanes. “Curb” lane enhances pedestrian safety and acts as boundary between the roadway and adjacent areas like the sidewalk. Curbs also help channel water to drainage systems. Fillets hold more importance for curbs where the vehicle transition between the road and the curb is often required to be smooth. The vehicle interaction with the edge of the median or the fillet is of less functional importance for “Raised Median” type lanes. You can refer to the following documentation link that explains the difference between the two lane types in the “Attribute” pane:

https://www.mathworks.com/help/releases/R2024a/roadrunner/ref/lanetool.html#appparameters

A possible workaround is to use the “Curb” lane itself as a median-type lane as all the attribute options in “Raised Median” lane are also available in “Curb” lane.

I hope this helps with your query.

[Terry]

Hello,

Thank you for getting back to me on this subject.

I actually made a mistake in my initial post; the fillet is okay as is and I understand its functionality. I would like to get rid of the 'gap fillet depth', the groove in the curb.

I tried this workaround before, using two curb lanes with a sidewalk lane in the center. Unfortunately, this does not work because of the way roadrunner handles lane 'facing'. Using curb lanes in place of medians causes the curbs to be facing the wrong direction, as their direction is determined by which side they are on of the center of the road style. For example, if I have a 4 lane road, with a median separating the lanes into groups of 2, using a curb instead of a raised median forces the lane height on one side to match the upper side of the curb, as seen in this image:

Is there something I'm missing about lane settings? Is it possibe to change the way a curb is 'facing'?

Thank you,

Terry