Diamond lanes are reserved for vehicles with:

Diamond lanes, also known as High-Occupancy Vehicle (HOV) lanes, are designated for vehicles with two or more people. The primary goal of these lanes is to encourage carpooling and reduce congestion on busy roadways by promoting the use of vehicles that carry multiple passengers. By allowing vehicles with multiple occupants to use these special lanes, traffic flow improves, and it can help decrease travel times for those who are taking advantage of the carpooling options.

In contrast, lanes that are used by single-occupancy vehicles are often more congested, leading to longer travel times on primary roadways. Therefore, the rules governing diamond lanes are designed specifically to incentivize shared rides and improve overall traffic conditions. This focus on reducing traffic volume and promoting efficient use of road space is why the presence of two or more individuals in a vehicle is the requirement for using these lanes.