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reserved lanes
A carpool lane is a special freeway lane only for buses and/or carpools. You may use a carpool lane or onramp if your vehicle carries the minimum number of people required for the carpool lane or you drive a low-emission vehicle displaying a special DMV-issued decal. Motorcycle riders may use designated carpool lanes, unless otherwise posted. Signs at the onramp or along the freeway tell you the minimum number of people required for the carpool and the hours the carpool requirement applies. The pavement in this lane is marked with a diamond symbol (◊) and the words "Carpool Lane." These lanes are also known as high-occupancy vehicle (HOV) lanes. Do not cross over double parallel solid lines to enter or exit any carpool lane except at designated entry or exit places. Vehicles towing trailers are typically not allowed to use carpool lanes because they must drive more slowly and are usually restricted to the right-hand lane.
Those are High Occupancy Vehicle (HOV) lanes. To some, they may be known as carpool lanes. To those who've been caught driving by themselves in those lanes, they may be known as "high dollar" lanes.
This depends on the state, or on local ordinances. Here in California, yes, motorcycles can use the carpool lanes.
HOV lanes are indicated by diamonds on pavement and on road signs; sometimes the lanes are called "diamond lanes."
Rserved Lanes
They are called diamond lanes because they are marked with big white diamond shapes on the pavement. These lanes are for a special kind of traffic, typically cyclists.
Text can be used with a diamond symbol to delineate
The Diamond Lane is the carpool lane in California. The cars that are allowed in these lanes are White Clean Air and Green Clean Air vehicle sticker cars.
In Washington state, the carpool lanes on on-ramps allow cars with the correct number of occupants to bypass ramp meters (the signals on some on-ramps).
Yes
A diamond symbol painted on a lane indicates a car pool lane. It is usually not legal to drive in these lanes unless you are part of a car pool.