This classic Roman road can be found in Ostia Antica just outside of Rome.
The top course of a Roman road, according to Vitruvius, was the summum dorsum, polygonal blocks of stone that were six inches or more thick and carefully fitted atop still moist concrete-like material. A road was nine to twelve feet wide which allowed two chariots to pass in each direction. Sometimes the road was edged with a high stone walkway and milemarkers indicated the distance.
Decumanus is a Roman surveying term for east-west streets in Roman towns, as opposed to cardo for the north-south streets.
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