Save money.
Because people are "pooling together" for a single purpose.
Two
2 or more people in one vehicle
Car pool is a term used to refer to two or more coworkers sharing the same car in order to get to their work. In some places there are special lanes for people who are car pooling to use.
A pool is a group of things or people that can be used as needed, such as a secretarial pool or a car pool. There are many cars available, but you only use the one(s) immediately needed for that day's job. A car pool is typically formed of the cars of various school parents who have agreed to drive all of the children in the pool to classes every few days (depending on how many parents are in the pool).
Car pool with several people
Clean the earth of garbage, recycle waste products always, and car-pool. Don't take so many cars out when there is room in a car for more people.
hopefully at least one driving........are you refering to car pool rules maybe?
Yes, any pool should have some sort of area when people can safely walk considering their feet will be wet. So this features should be thought when building any pool.
as many as you want or as many people that could fit in your pool?
A pool where cars go swimming
A swimming pool should have fencing around it to prevent young children and people with disabilities , that make them unable to swim , from falling in. In some countries it's illegal for a pool to not have a fencing around it.