After a certain density of deliveries in sectors is reached, the subj ceases to be a trivial task, and reliance on the route’s obviousness and the driver’s common sense is less and less justified by practical results.

Whereas hidden optimization resources are significant: 22 or 24 daily deliveries per vehicle makes a big difference.
Especially if you have dozens or hundreds of vehicles.

In general terms, the travelling saleseman’s task is a very complicated mathematical problem. But in our narrowly formulated conditions it is quite easy to solve using computerized algorithms.

There are specialized logistical software products, of which
Antor is one of the best-known.
Its work scheme is simple: your list of deliveries is uploaded into Antor in a certain format and then downloaded back, sorted according to the optimal order of execution:

Antor is rather a powerful piece of software with sprawling functionality. 
The underside is that it is rather expensive and hard to set up and use – too much so, given the limited tasks of the automation of urban distribution.

Also on the negative side, the lack of automatic data exchange (Antor had no API implemented by that time) necessitated manual upload and download by the operator. With all the entailments.
The software’s inability to process addresses outside the KLADR address classifier format didn’t improve user experience much, either.
In short, after having worked with Antor for some time, at least three Ultima operator companies renounced it.

For those customers we developed our own optimal route calculation service, naturally integrated into the Ultimate IEM system.

The routes are calculated using the Google and Yandex APIs that provide convenient and efficient geocoding and geolocation tools.
And, what is damn specific, perfectly free ones.

The Google and Yandex APIs are used to extract the coordinates of the delivery points and the actual motorway distances between the pairs of addresses.
The optimal routes is calculated inside Ultima with the time intervals, the goods’ weight and dimensions, etc. taken into account.

Naturally, the whole thing works automatically and requires no human [usually cack-handed] interference, barring force majeure.