Just like any large city: it has a grid-like pattern in the downtown part of the city, but most developments made after the 1950's are of organic nature and have different patterns to accommodate the increasing traffic and mass transit systems. If you look at Google Earth or any map of the city on the web, you can see such arrangements.
On the other hand, if you mean how are the roads repaired, they usually pour a mix of asphalt and small concrete pebbles on any pothole or cracks that are easy to fix. On larger stretches of road they first remove the asphalt with a saw-like machine and then pour the aforementioned mix. Finally, they flatten the "patch" with a steamroller.
Mexico is ground zero, all the roads start and finish in Mexico City, so all the roads stated from Mexico City, since Mexico City is the capital of capitals, as one of its names it has always been an imperial city, so that is why all the roads lead to Mexico City.
------------------------------------- this much
I dont have the milage but there is a great page to get distance, roads, etc. Go to sct.gob.mx
The driving distance is 1,864.28 miles by road.
Mexico City (See related links)
1,460 miles or 2349km
There are paved highways and freeways among most cities in Mexico. There are of course rural roads and pathways which are unpaved.
Country roads that are not in the city
This refers to buildings that are arranged around a town with divergent or convergent roads.
Mexico City.
Mexico City
The city is responsible for making the roads. Each city is given money from the federal government to take care of the roads.