Do you use the Maxis Highway Override Mod which came with the NAM a few versions ago, otherwise known as Project Symphony? Are you also using the Overpass mod from the Japanese NAM Facelift Mod? If so, you'll want this compatibility patch which updates all the models to cross MHO. Note: An earlier version of this file was previously included with my MHO Patch Mod, which is now obsolete.
Please update your NAM version to 35 or later which includes all the other fixes and much more besides. If you previously used the MHO Patch Mod, you should remove it's installation folder/contents entirely.
I.e. the folder "M - MHO Patch" inside the "z____MGB Mods" folder.
Dependencies SC4 with NAM (version 35 or later highly recommended) and the Maxis Highway Override installed. The Alternate Overpasses mod from the Japanese NAM Facelift Mod (full details/links/tutorial can be found here). Installation / Load Order Load order for this mod may be a little tricky. The Jap NAM Facelift mod must load after "z___NAM" to work correctly. But this mod need to load both after that and also the Jap NAM Facelift mod. I've actually included with this mod a dedicated folder where you should move the Jap NAM FL mod, to ensure everything works. So when you extract the included .zip file, you get a folder "z____MGB Mods", including two subfolders "A - JapNAMFL" & "Z - Final Load". You should copy the extracted folder into the root of your plugins folder. If a prompt appears, click OK to Merge/Overwrite any files/folders. Then find the installation folder of the Jap NAM Facelift mod and place it inside the "z____MGB Mods\A - JapNAMFL" folder. This is the one and only supported setup. If you need to manage load order differently, that's totally fine, but I won't officially support this.
Support

Having problems? Got comments? Then why not visit my development/support thread at Simtropolis: