Imagine a shared car rental service within a residential complex.
The number of people using cars is limited, usually no more than 50 to 100 users.

In short, you live in a large housing complex that owns 10 shared rental cars. You pay extra fee to subscribe to car rental service and now you have a couple of different cars that you can use anytime you need. You pick up a car from the complex and return it to the same place.
The cars are used exclusively by the residents.

Smoking and non smoking vehicles are clearly separated.
You do not worry about what previous users did inside the car, because people naturally trust their neighbors.
In general, people tend to live with others who are demographically similar, and this shared context creates trust.

you can also add extra money to system instead of buying a car. Meaning, you can share your car or you can just buy a car with your neighbor. Imagine having 2 cars for 5 family.