I have not tried on the actual toll roads up in Orange County. There is an Express Lane I use a few times a month, but it is free for car pools, meaning free for Motorcycles. In fact, One can drive solo in the express lane with a transponder and pay the tolls, which I do on occasion when I am in my car, but if you drive solo in the express lane without a transponder and the CHP happens to see you, you can get a ticket.
2007 VStar 1300 Touring (road trip/weekend bike)
2003 FZ-1 (daily commuter)