What does a diamond-shaped symbol in a lane indicate?

A diamond-shaped symbol in a lane specifically indicates that the lane is reserved for high occupancy vehicles (HOV). HOV lanes are designed to encourage carpooling by providing a dedicated space for vehicles that carry more than one passenger, usually a minimum of two or three, depending on the regulations in place.

The use of the diamond shape is a clear and recognizable sign to drivers that this lane has restrictions and is not available for single-occupant vehicles. This helps manage traffic, reduce congestion, and promote more efficient use of roadways by encouraging people to share rides.

The other types of lanes, such as those dedicated to bicycles, emergency vehicles, or public transport, have different symbols or signage to indicate their specific usage restrictions, making it important for drivers to be aware of these distinctions while navigating the roads.