infinite loading screen when travelling

@sweeyener  Okay, so the save itself is a bit overloaded, and the game engine is strained enough that the travel transition is failing.  Without mods, all you can do is relieve as much of the stress as possible and hope for the best:

• Empty your sims' inventories as much as possible.  A few items is fine; a hundred is not.
• Use "save as" to rename the save, then quit (without saving) immediately before you want to travel.
• Load the game just to the Main Menu.  Turn off memories, the in-game shopping experience, and the hidden object interactive loading screens.
• Lower all the graphics settings to the minimum.  (You can revert to your normal settings after the travel transition.)  Now quit the game again, without loading a save.
• Delete the five cache files in your game folder in Documents: CASPartCache, compositorCache, scriptCache, simCompositorCache, and socialCache.
• Empty out everything in FeaturedItems as well.
• If you play through Origin, sign in and then put Origin in offline mode.  Now disconnect your computer from the internet—turn off wifi and/or pull the ethernet cord.
• Now launch your game, load the save, and send your sims traveling right away, as soon as the game clock starts moving forward.

If this doesn't help, then adding a couple of mods is the only other suggestion I have.  There is one mod specifically meant to fix the broken travel transition, and two more that clean up errors and bad data in general.  Let me know if you're interested.