In Case You Were Wondering

What was the quickest route from Roma to Lutetia (Paris) in 205AD?  What was the cheapest route?

Or:

"Imagine you're in Rome, it's 205 CE, and you've got to figure out the quickest way to transport wheat to Virunum, in what's now Austria. Your transportation choices are limited: ox cart, mule, ship or by foot, and your budget is tight. What do you do?"

Now you can find out via the Stanford University ORBIS Geospatial Network Model of the Roman World



You can go directly to ORBIS and plot hundreds of routes by land, sea and types of material to be moved.

You can finally plan a real Roman Empire holiday!

And for the City itself you can use this reference, though it's a century later.