Car pool and diamond lanes are separate traffic lanes that allow commuters to bypass the regular traffic lanes.
The lanes usually have restrictions on who can use them. In most cases you must have more than one person in the car, or drive an environmentally friendly car (like natural gas or electric car). Some states are now allowing hybrid cars to use these lanes, too, regardless of the number of passengers or vehicle emissions rating.
Cities use carpool and diamond lanes as a way to decrease traffic congestion and pollution.
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