There's a very good white paper here, but I have not been able to get the site to load for a couple days now.
http://imaginit.rand.com/files/C3D2008%20ROW-White_Paper.pdf
I've attached a document describing a similar method that's based on the method in the above link. The cool part is that you can leverage it to label anything you wish in a RW view. I've been using it to show RW and also lane lines.
One quirk with the profile grade method is that any time you re-enter the profile grade editor it deletes any prior edits... so if you wish to add another RW line, say, you will have to add ALL the RW lines.
Jeffrey Rivers
Win 10 Pro 64-bit, Intel i9 3.7GHz, 64 GB
NVIDIA RTX A4000
C3D 2020 V13.2.89.0