How to count the number of intersections in a particular city?

Question

Analytics

Tell me the easiest and fastest way to calculate the number of intersections in any city?
There is an idea to download a map in a vector and somehow calculate the nodes using programs, but firstly, I don’t know where to get a map in a vector, although there are Google maps, you can somehow download them, and secondly, what program to calculate all intersections.
Also interested in how to find out the length of all roads?
I would be very grateful if you could advise

Answer 1

The question is just like at an interview :)
The number of roads should be known - there are all sorts of reference books, GIS systems.
Because abstract question - we draw an abstract system close to reality.
One road crosses another on average 1 time (we do not have the conditions of perpendicularity, as well as the fact that the roads are straight), 2 times - it is doubtful, but it can be imagined as an isolated case. 0 is quite possible.
Then you can make an analysis of how many intersections one road has on average, a closed number, which we then extrapolate to the system as a whole, which can very likely be erroneous, but can give an approximate result. Further, for example, we make the assumption that there are 50 roads, the average frequency is 5 = 250 intersections. For a detailed system, give the teacher of mathematical analysis :) Well, here, in theory, the division should be done in the system according to the types of roads and their lengths, etc., where the formula will be more complicated.
If you need a specific answer: the road ministries should be aware and publish data, maybe Rosstat has such data.
You can find out the length from the same 2Gis, where the lengths are set the same, through the desktop version or ask them themselves :)
Small GIS systems should have a vector map, in my hometown they made their own GIS system in the Russian Academy of Sciences, I don’t know why, maybe for the defense industry.
In general, here are 3 answers, one abstract for a system in which you need to enter the number of roads (which can be found in any directory) and make statistics on a limited interval (say 20 roads), from where you get an APPROXIMATE number.
UPD: did I pass? :D

Answer 2

It should be like this:

RewriteEngine On
RewriteRule ([^/]+)/?$ http://site.ru/$1 [L,R=301]