How social services work (Cities: Skylines)

There are modifications to garbage trucks and hearses that optimize their work, but even so, everything is clear with them. There are no special questions with the fire department and the police either, in terms of understanding the logic of their work in the game. The principle of operation of ambulances and the hospitals themselves is completely incomprehensible. If there is one clinic or hospital on the map, then everything seems to be clear, but if there are two in different districts, then it is not clear why only one accepts calls. On the map, there is a large city with remote areas, throughout the city and in remote areas, full coverage by polyclinics or hospitals, but calls are first of all sent from a polyclinic in the farthest area to a city full of clinics and hospitals, and only if there are no cars enough, a clinic from another area is involved, and it is also not close to the "caller". I did not find modifications on the theme of ambulances,