The El Monte Busway
The El Monte Busway is a special freeway lane from Downtown LA to El Monte on I-10 (San Bernardino Freeway) built for buses. Carpools are allowed to use it with the following rules:
Mon-Fri AM rush (6-9 AM) and PM rush (4-7 PM): 3 or more passengers only.
In 2000, a demonstration project started by State Senator Hilda Solis reduced that number to 2 and made it a regular carpool lane. This caused MASSIVE CONGESTION on the originally FAST FLOWING Busway, causing big delays for passengers of 454 express buses, as well as 3-passenger carpoolers, frustrating thousands of commuters everyday. For details, read the Jan. 22, 2000 Los Angeles Times Easing of Carpool Rules Backfires as Lanes Jam.
You can purchase the LA Times story here.