No problem, I see the score in your 54k map.

https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3470361345

No problem, I'll get to uploading it. It might just be one of those cases where it's a little luck based with different slip roads working for different drawings. For mine I just found that traffic flow overall was pretty poor so it was a cheap slip road to add, and it increased my score by about 50.

This tweak might not be universal. In my current run, that slip road lowers the score.

Could you please share a screenshot so I can proclaim your win?

Managed 702 now. It was just a case of adding a slip road from 52S to bottom green.

Wow, incredible layout. I worked for a bit at this level but couldn't get anything to stick; I wouldn't have even come close to this - it's very surprising this layout works with the tiny amount of roads. I'll certainly have a go.