"When the regular lanes grew more crowded with hybrids, engineering Professor Michael Cassidy and doctoral student Kitae Jang said, carpoolers had to match the sluggish pace while moving in and out of their special lane.
In addition, Cassidy said in an interview, "You're not going to drive 70 mph in the carpool lane if the lane next to you is moving at 20. At any moment, someone can come into your lane."
However, the 'gap' of the 85,000 hybrids bearing yellow stickers may eventually be filled with paying single-occupant-vehicles if the Metropolitan Transportation Commission has its way. In addition, 'cleaner' vehicles than the hybrids may fill the gap due to 2010 legislation. This Air Resources Board webpage shows the three clean air stickers: Yellow is now expired after having been extended for six months, white was renewed last year until Jan 1, 2015, and green will be available on Jan 1, 2012, valid for three years.
Thanks to MTC Library