characters for edge crossing/edge casing

[Matt Rice]

I had looked, but couldn't find any characters suitable for edge crossing/casing
such as tunnel's, bridges in the following paper, suitable for
orthogonal graph layouts.
e.g. vertical/horizontal crossing, somwhat similar to the characters
⤫, ⤫ U+292B-U+292C, but at 90 degrees.

https://arxiv.org/pdf/0705.0413.pdf

Or another style of crossing which I forget the name of,
https://www.yworks.com/assets/images/features/bridges.ff977b3c.svg

Have characters for this purpose been proposed before?