Hopefully someone with more information will speak up, I can't tell you what it will cost, but I think the fact that it's electronic means that there is no attendant monitoring the toll booths, there is just a mechanical collector that you throw your money into and continue on down the road. There will be camera's mounted to record your license plate and vehicle details in case you try to not pay. And they'll mail you a fine if you fail to pay. I don't think you can get change at the toll booths, so be prepared with a variety of change or you can throw more than what's needed in and the state won't complain a bit!
Steve & Nancy
2005 Itasca Sunrise 33', W20 Chassis, Ultrapower, Henderson Trac Bar
2012 Chevy Captiva Sport AWD, ReadyBrute Elite Tow Bar, Blue Ox Base Plate, Protect-A-Tow