meanwhile I saw some gameplay on youtube ..
to me it is a bit indigestible the isometric view but I think in the end I could get used to ..
I have not understood what is your view closer you can get .. they all use the view from the clouds!
so there are, like the NMT, DC and FM for Banished, two or three BIG mod that improve and implement the game?
a curiosity .. I did not understand why the cars disappear from the streets ...
in the game you can build tunnels?
Elevating sidewalks for pedestrians?
As for the isometric view, SC 4 is now pretty old and its graphics represent the state of the art when it came out, so . . . .
You can get pretty close, but not down to street level. The distance is not continuous, but in steps. Some detail is only visible from closer levels.
Which mods are crucial depends on who you ask. There are at least two members of World of Banished who know far, far more about SC4 and SC4 mods than I do: Paeng and A Nonny Moose. You should get their advice and views on "necessary" mods. For me the Network Add-on Mod (NAM) is absolutely essential. I also use the Colossus Addon Mod (CAM) which makes much larger populations possible. Beyond that it is up to personal preference. There are thousands and thousands of custom content contributions out there that you can create almost any sort of city you want. There are more or less accurate maps of regions all over the world, plus many fantasy maps. I doubt anyone can tell you how many buildings are available, but SC4 architects from all over the world have contributed buildings unique and ordinary from their favorite cities. My favorite sources have always been Simtropolis (STEX) and SC4Devotion (LEX), so go to those sites and you can see the massive choice. If you want to get an idea of what is possible look at the many "Mayor's Diary" entries.
Sometimes cars (Not to mention trains and other vehicles) just disappear. They are only graphic representations anyway, so not to worry. If you want to you can "self drive." There is a traffic overlay that shows traffic density. The NAM includes options for increasing traffic capacity and public transit usage. The biggest problem with over-capacity traffic in SC4 is that it can interfere with commute times and cause unemployment. Sims will commute to neighboring towns to get jobs if you have connections--regional connections is one of SC4's better points.
Tunnels appear when you build roads or tracks through mountains. Subways are part of the game. Other underground networks can be added through mods.
There may be a mod for elevated sidewalks, but I've never seen one. The "BSC Parks" mods contain pedestrian bridges. NAM has pedestrian walks for pedestrian-only zones, but I don't think they can be elevated--but I'm no expert on that.