English:
The major roads of Italy (going from Rome) are as follows, going clockwise from the left:

Green: Via Aurelia -> Via Aumelia Scaura -> Via Julia Augusta Bright green: Via Clodia
Yellow: Via Cassia
Blue: Via Flaminia
Grey: Via Salaria
Dark purple -> purple: Via Tiburtina -> Via Valeria
Carrot red: Via Latina
Bright red: Via Appia
Dark blue: Via Ostiensis

Additional major roads specified on the map:
Via Popilia, going to southern Italy (Rhegium) from Via Latina
and Via Appia crossroads. (cyan)
Via Traiana, branching from Via Appia and also going to Brundisium. (dark red)
Via Aemilia, starting from the end of Via Flaminia at Ariminum and going to Placentia. (orange)
Via Postumia, going from Genua (Genoa) on the northwest of Italy to Aquileia on the northeast. (dark green)
== Licensing ==

Public domainPublic domainfalsefalse

Moi, propriétaire des droits d’auteur sur cette œuvre, la place dans le domaine public. Ceci s'applique dans le monde entier. Dans certains pays, ceci peut ne pas être possible ; dans ce cas : J’accorde à toute personne le droit d’utiliser cette œuvre dans n’importe quel but, sans aucune condition, sauf celles requises par la loi.

The data from this map was collected from pages 26, 27, 30, and 31 of the 1926 edition of the "Historical Atlas", by William R. Shepherd. The scans used to trace the paths were downloaded from the University of Texas Libraries at:
http://www.lib.utexas.edu/maps/historical/history_shepherd_1923.html

Specifically:
http://www.lib.utexas.edu/maps/historical/shepherd/italy_ancient_north.jpg
http://www.lib.utexas.edu/maps/historical/shepherd/italy_ancient_south.jpg

I cannot find the latest date these roads were all built in except to say that they were all extremely likely to have been built before 476AD, the ceremonial demise of the Western Roman Empire.

I could add the PNG background but I am as yet unsure how I would embed it in an svg.

Corrections and additions are welcome!