What type of marking is used to indicate that a lane is reserved for carpools and buses?

The type of marking used to indicate that a lane is reserved for carpools and buses is diamond markings. These diamond symbols painted in the lane are specifically designated to communicate that the lane is for high-occupancy vehicles (HOV) such as carpools and buses. This is important for traffic management and encouraging the use of shared transportation methods, which can help reduce congestion and promote environmentally friendly travel.

Other options do not serve this purpose. A single solid line typically indicates that lane changes are not permitted, while a broken yellow line is often used to separate lanes of opposing traffic, allowing for passing where safe. X markings are commonly found at railway crossings and do not pertain to lane usage regulations. Understanding these lane markings is essential for maintaining proper traffic flow and ensuring safety on the roads.