The cardo was the main north–south-oriented street in Roman cities, military camps, and coloniae. The cardo, an integral component of city planning, was lined with shops and vendors, and served as a hub of economic life. The main cardo was called cardo maximus.
Most Roman cities also had a decumanus maximus, an east-west street that served as a secondary main street. Due to varying geography, in some cities, just like in Poreč, the decumanus is the main street and the cardo is secondary.