ORBIS: The Stanford Geospatial Network Model of the Roman WorldReconstructs the time cost and financial expense associated with a wide range of different types of travel in antiquity. The model is based on a simplified version of the giant network of cities, roads, rivers and sea lanes that framed movement across the Roman Empire. It broadly reflects conditions around 200 CE but also covers a few sites and roads created in late antiquity.
An Encyclopedia of the History of Classical Archaeology [2 Volumes] by 
Atlas of the Celtic World by 