In 2010 I posted in the official Total War forum a quick fix about how to add a road in Agusta Vindelicorum in the Raetia region.

Original post

Original post
Quote Originally Posted by Leonardo
Question #49: Why must I build a road in Agusta Vindelicorum, when there is already a road in the Raetia region on the campaign map and how do I fix it?

This map fix has the best result if it's fixed before you start a new game. Locate this file:

<path>\Rome - Total War\BI\data\world\maps\campaign\barbarian_invasion\descr_strat.txt

settlement
{
level large_town
region Raetia

year_founded 1
population 5504
plan_set default_set
faction_creator empire_west
building
{
type core_building governors_villa
}
building
{
type barracks militia_barracks
}
building
{
type temple_of_mithras temple_of_mithras_shrine
}
building
{
type defenses wooden_wall
}
}

Answer #49: Between the type barracks and the type temple should there be a type road.

Edit the file in notepad and copy this text:

building
{
type hinterland_roads roads
}


Paste it the text between these lines:

building
{
type barracks militia_barracks
}
building
{
type hinterland_roads roads
}
building
{
type temple_of_mithras temple_of_mithras_shrine
}

Make sure the edit file has these lines for the Raetia settlement is shown below and save the file.
Don't forget the spaces from the left of each line.

<path>\Rome - Total War\BI\data\world\maps\campaign\barbarian_invasion\descr_strat

settlement
{
level large_town
region Raetia

year_founded 1
population 5504
plan_set default_set
faction_creator empire_west
building
{
type core_building governors_villa
}
building
{
type barracks militia_barracks
}
building
{
type hinterland_roads roads
}
building
{
type temple_of_mithras temple_of_mithras_shrine
}
building
{
type defenses wooden_wall
}
}

You can check this map fix through a new game and select the Western Roman Empire faction.

The result should be like the picture in the spoiler.
Spoiler Alert, click show to read: 

I only reposted this map fix due for not visiting the official forum anymore and of course the uploaded picture I had in that post can no longer be viewed as imageshack changed their policy a few years ago.

To moderators: Feel free to move this post to the correct forum and/or edit it if necessary.