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A "diamond lane" is another name for a "HOV (High Occupancy Vehicle) Lane," so named because they are typically marked with diamonds painted on the pavement (and sometimes on lighted signs above them). A high-occupancy vehicle lane (also known as an HOV lane, carpool lane, diamond lane, 2+ lane, and transit lane or T2 or T3 lanes) is a restricted traffic ...


A special driving lane reserved for specific types of traffic. In the United States and Canada, a diamond lane is a special lane on a street or highway that is reserved for specific types of traffic. These lanes are usually marked with white diamonds or lozenge, hence their name. Diamond lanes are generally the right-most or left-most lane on the ...

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