For those of you planning on visiting Southern California, you need to know that as of May, 2014, none of their toll booths will be manned, and you have to have an express account on record or a Fast Trak pass. If you are a visitor, they suggest you set up an account in advance or use a friend or relative's account by adding your license plate. Only other option is to pay within 48 hours by going online and charging any tolls to your credit card. There is also a mobile phone app, but none of these sound very friendly or welcoming to visitors who don't know about this in advance!!
Their site for visitors is at https://www.thetollroads.com/ontheroads/for-visitors.php
The web site says they want your visit to be enjoyable, but mine certainly was not, considering I just got a $59 fine for going through an unmanned toll booth that would take only correct change when I had nothing but a $20 bill. It would also not take a credit card or accept larger amounts and give change!! I have submitted a formal dispute, but this really irritates me. There was NOTHING on that toll booth that told you how to pay if you did not have the correct cash or an electronic pass.
I think it will be a very long time before I go back to southern California, especially considering the $40 motorhome parking at the Queen Mary, and the nasty campground staff in Laguna Beach.