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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.
The white line on a carpool lane is typically used to separate the carpool lane from the regular lanes of traffic. It helps to clearly define the space designated for vehicles with multiple occupants, encouraging compliance with the carpool lane rules and improving traffic flow.
HOV lanes are indicated by diamonds on pavement and on road signs; sometimes the lanes are called "diamond lanes."
Hov
No, you cannot.
No.
This depends on the state, or on local ordinances. Here in California, yes, motorcycles can use the carpool lanes.
Depending on the location, HOV lanes (also known as "car pool lanes") require two or three occupants. Watch for the signs. If you have a special sticker, your hybrid or alternative-fuel vehicle may be used alone in an HOV lane.
A dead body being transported as cargo does not count as an occupant. HOV lanes requires two or more occupants (presumably, living occupants) in the passenger compartment of the vehicle.
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.
If you have the designated number of passengers in your vehicle or a special DMV HOV decal.
HOV lanes