In Italy, what does a circular sign marked “ZTL” identify?

In Italy, a circular sign marked “ZTL” identifies a limited traffic zone.

ZTL stands for zona a traffico limitato, meaning “limited traffic zone.” These areas restrict access to certain vehicles, often to protect historic city centres from congestion, pollution, and damage. Entry may be allowed only to residents, taxis, buses, delivery vehicles, or vehicles with specific permits. Restrictions can also apply only during posted hours.

Italian municipalities commonly enforce ZTL rules with cameras that record vehicle registration plates. A driver who enters without authorization may receive a penalty even if the street appears open and no physical barrier is present.

Visitors often mistake a ZTL for a pedestrian-only area. The two are not identical: a limited traffic zone can allow selected motor vehicles under stated conditions. Signs, supplementary panels, and local regulations determine exactly who may enter and when.