Is your feature request related to a problem? Please describe.
Every time I want to make a highway it's hard to deal with the lack of double line corners.

Describe the solution you'd like
I think that there should be a double line corners just like the middle edge lines.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context

Thank you for your suggestion. It should be up on CurseForge in a few minutes.