What does a white diamond symbol on the road indicate?

The white diamond symbol on the road specifically indicates that the lane is reserved for high-occupancy vehicles (HOV) or has restrictions regarding usage, such as only being open to carpools, buses, or other specified vehicles. This symbol serves to encourage carpooling and efficient use of lane capacity, helping to reduce traffic congestion and promote environmentally friendly travel options. Understanding this symbol is crucial for drivers to comply with lane usage rules, ensuring they are utilizing the roadway as intended and avoiding potential fines or penalties for unauthorized use of restricted lanes.