I have a 4 year old and an 18 month old, and I don't own a car (nor does my partner).
We rent a car ~10-20 times a year, but that's usually for vacations or trips out of the city to visit family. Regular weekly family life we use buses, the underground (metro), trains, or sometimes taxis.
We are considering eventually getting a car, but we've managed for 4 years with children to not need one and it's not been an issue.
A good portion of this stuff does still go on in Games Development.
I don't work in games any more, but on the last title I worked on (Forza Horizon, Xbox 360), one of my colleagues engaged in a very similar exercise in order to allow data for the open world to be streamed in quick enough to deal with car (travelling at potentially 150+mph) to drive through the world without having to wait for loads, whilst streaming direct from the DVD (we weren't allowed to install to the HDD).
Given that the world was open and you could drive in pretty much any direction, trying to pre-load the right tiles of the world was difficult, and seek times made it tough to bring stuff in if it wasn't all packed together. However we were almost at the limit of DVD capacity so we couldn't do much duplication of assets to lower the amount of seeking required.
My colleague wrote a system that took about 8 hours overnight (running on a grid) to compute a best attempt at some kind of optimized packing. It did work though!
To be fair it's a 6-bedroom wing, but still a fun fact.