What does a solid yellow line mean in Italy?

A solid yellow line in Italy indicates that no passing is allowed. This means that drivers should not overtake other vehicles in the lane adjacent to the solid yellow line. It serves as a safety measure designed to prevent accidents, particularly in areas where visibility may be limited or where the road conditions are not suitable for overtaking maneuvers.

The presence of this line typically denotes sections of the road where passing could pose a significant risk to drivers and other road users. It's important to adhere to this rule for the safety of everyone on the road, as it helps maintain orderly traffic flow and reduces the likelihood of collisions.