What is required for a lane to be designated as a diamond lane?

A lane designated as a diamond lane is specifically intended to promote carpooling and reduce traffic congestion by encouraging drivers to share rides. The primary requirement for using a diamond lane is that vehicles must have two or more occupants. This regulation is meant to maximize the efficiency of road use, as it prioritizes vehicles carrying multiple passengers over those with single drivers.

This approach helps improve overall traffic flow, reduce emissions, and lower fuel consumption by discouraging single-occupancy vehicles from using these lanes. Consequently, options that indicate allowing only single drivers, unrestricted access for all vehicles, or exclusive access for commercial vehicles do not align with the purpose of diamond lanes.