General purpose lanes may add highway capacity more effectively than HOV lanes. HOV lanes supposedly reduce congestion and harmful emissions because they encourage ridesharing and transit use. Just add a few passengers, and you can be rewarded with a fast, pleasant drive to work. That's the ideal behind HOV lanes.
Similarly, what is carpool lane for?
High-Occupancy Vehicle (HOV) lane, also known as the carpool or diamond lane, is a traffic management strategy to promote and encourage ridesharing; thereby alleviating congestion and maximizing the people-carrying capacity of California highways. All other vehicles may use the lanes during off-peak hours.
Can you use the carpool lane as a passing lane?
“If you meet the passenger requirement, then you can use the HOV lane as a passing lane, but if you are the only occupant then you cannot enter the HOV lane at any point.” The number of people required to drive in a carpool lane can vary.
When can you get out of the carpool lane?
If the conditions are right and you can change lanes safely, go ahead. However, the carpool lane is an exception. The white line in this case, is there as a lane barrier and should not be crossed until there is a designated entry/exit place marked by broken lines.