here is the prefab, im not able to add this prefab 1:1 as my original so u need do apply terrain modifier on the roads and better u use ur own splat painting coz this one dont looks good as my original. :/
anyone have some tipps how i safe a prefab 1:1 ?
https://www.dropbox.com/s/egxt9fxxr0wtrle/Rock Tunnel#3.prefab.splat1?dl=1
https://www.dropbox.com/s/2k46agl9nmx7v59/Rock Tunnel#3.prefab.splat0?dl=1
https://www.dropbox.com/s/re7idgrzf2n7igm/Rock Tunnel#3.prefab.heights?dl=1
https://www.dropbox.com/s/xs3fjza6mgqjzik/Rock Tunnel#3.prefab?dl=1