Because taxes aren't high enough that they need to charge you extra to use what you already paid for!
I'm on a motorcycle so no charge for me.
I thought us motorcyclists only got a free pass in HOV lanes?
-John
The HOT lanes here are free for HOV. Motorcycles are automagically HOV. This includes the HOT lanes on 95 and 495. I have not paid one penny to ride on these since they started the program. Motorcycles are exempt. I'm not going to complain