A program for the logistics of several taxi cars?

Question

Google Maps

Such a thing: periodically there are 15-25 people who need to be driven around the city in several taxis. Is there any program / service that would automate the process of dividing people into cars, taking into account cost reduction?
Or take the Google Maps API documentation and write it yourself?
UPD. I am not a taxi driver, and I am not going to open my own taxi company. I'm just one of these 15-25 people (and they are always different), and we don't want to overpay for a taxi ... The only thing we can save is the number of cars, time, and distance that the cars will cover. All taxis will always start from the same point, and we don't care where they go next.

Answer 1

Mass delivery service for employees after corporate booze :)
In general, it's best to have an INTELLIGENT person who knows the city well)
Cheap and cheerful.
As for the rest, this is already such a specific task that it looks like “something of your own” is easier.

Answer 2

In principle, if you try, you can solve this through a traveling salesman. Limiting the length of the hop to 4 moves.
Have a look:
db.tt/QI6FScXB
May inspire you)

Answer 3

www.optimap.net/