How can I make Road Builder like in Cities: Skylines 2?

Hello Everyone! I’m making right now game like Cities: Skylines 2, and I want to add Road Builder system like in a Cities: Skylines, but I don’t know where to start.
I mean like, I already know that I’ll use a lot of Bezier Curves and I watched videos about it a lot of times. But… I don’t know how to create main system.

I want to make it like in Theme Park Tycoon 2 that it’s showing how the road will be looking like on the screenshot I pinned here. And then Player clicks on the LMB and then builds it.

Can someone give me ideas or help me? That would be really appreciated!

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Cities skylines is impossible to make,one condition you need is to have a giant plot of land and since part has a max size of 2048 by 2048.it will be rough.

I mean, I’m making it like Cities: Skylines, not like a full copy of it. And the map won’t be that big.

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Actually,ther is one game that is similar to city skylines(Mini Cities 2)

–the only thing you can beat them is if you have transportation(set line and set stop) – This is a tough script btw