I will try resetting the whole town, townies and anything else I can find to clean up. I also use overwatch to stop memories, clean up the homeless, clean up stuck vehicles and stop pet adoption. If I have to give everyone a car, to me that defeats the purpose of the vehicle job of the mod, not to mention going back to my old practice. I think it's easier to take away all the parking spots in edit town. However, with the number I'm getting maybe giving eveyone a car may also help. For Twinbrook I would do that. I love it the most and I circle amongst about a dozen of the households. But to have to do this in every neighbourhood. Ouccch. I have lots. May think about eliminating some.
I do keep backups of all my game files on my main drive and an external drive, and in the library I keep any families with household, without house & their house in the lot bin that I care about. I also keep a copytown of Twinbrook because I have made quite a few changes and additions, so I don't want to have to do that all the time. Quintuple safety factors.