Here is some further clarification:
So, I tested this and apparently the map is included in the save file, so there's no need to download
it separately. This simplifies things for the future, as the game creator can modify the map as he wishes,
and then other players can simply pick up his save and the map at the same time.
However, you'll still need to download the save and put in the right folder.
By default, the savegame folder of Cities:Skylines is located as follows:
C:\Users\[username]\AppData\Local\Colossal Order\Cities_Skylines\Saves
Of these folders, the folder 'AppData' is hidden in Windows by default.
So you need to enable the viewing of hidden files in order to see it.
The way you do it is you go to:
Control Panel > Appearance and Modification [not sure what this is called in English; this is an ad-hoc translation from
my Finnish Windows] > Folder Settings > Show [or View] > Show hidden files, folders and drives (click the radio button next
to this, then click 'Apply' in the lower right corner of the Folder Settings panel)
I'm sure there are guides on the net for doing this, if my written description proves inadequate. Just google 'show hidden files in Windows'
or somesuch.
EDIT: It might also work to simply copy the path
( C:\Users\[
your username]\AppData\Local\Colossal Order\Cities_Skylines\Saves ) to the 'address bar' in Windows Explorer (the thing with which you navigate through the folders). I've never tried that, but in case it works then there's no need to enable the showing of hidden files at all.
For the record: there's no need to feel idiotic over not taking the time to learn the intricacies of a computer system that's bound
to become obsolete in the next 5-10 years, anyway. Soon we'll have computers where we simply tell them what to do by voice command,
and they'll do it, no mess no fuss no enabling or disabling, etc.
---
So, the week has passed and TheChaoticVoid has yet to post his save and report. I'm not comfortable with going back to the previous
save for JerkyJerry's turn, since that'd mean that we've wasted a week, in essence. I'll let Calad be the judge here, but in any case
much further waiting is an even worse option, imo. So I say we wait until tomorrow morning, and I'll pm TCV about this. In case there's
no answer by tomorrow morning, then JerkyJerry can pick up the previous save and start playing.
Here's the link to the previous save btw:
http://s000.tinyupload.com/index.php?file_id=82005128863186324708
(Now it all makes sense... The save format is the same as the map format, .crp. So the saves and maps are the same thing, basically.
Btw there's no need to unpack the file or modify it in any way; just put it in the Saves folder, and you should be able to load
it from within the game (as long as you've got the right mod(s) enabled).)
EDIT:
Unrelated, but this might be nice:
http://steamcommunity.com/sharedfiles/filedetails/?id=411164732
It's an Extended UI for laying mass transit lines; judging by the 180,000+ downloads, it might come in pretty handy.

I'm not sure if it works with Traffic Manager or Traffic++; maybe you could try it out, ItalianGuy (since you seem to be our transit expert)?