In Pompeii, a two-way traffic was impossible except for limited arteries, such as Strada Stabia and Viae della Fortuna, di Nola, and dell'Abbondanza. It has been suggested that cart-drivers adhered to the principle of driving on the right-hand side of streets. However, at the Nola, Sarno and Nocera gates, through which an one-way vehicle traffic was possible, vehicles had lay-bys on the left-hand sides. And the ruts remaining on the streets, which can provide the direction of carts, reveal that the carts were driven on the centre of the streets in both directions on via del Tempio di Iside.
