Do HOV made trips appear on your EZPass account the same as tolled trips do? I used my EZPass Flex for the first time a week and a half ago but nothing shows up when I check my account online. I am apprehensive about using it again until I know it is working. I don't want to find out by way of a letter telling me I owe hundreds of dollars in fines because of a malfunction or mismounted transponder as recently mentioned in the news.
If you're asking whether or not ALL trips taken on the toll roads show up (regardless of whether you pay a toll or not), the answer is "yes". Note - charges are posted several days after a trip is taken - there's a lag for some reason.
I took two people from the Pentagon to Horner Rd yesterday and was going to check the EZ Pass site in a few days, as it has been a while since I have used the flex option. I hope what mpatoka said, works.