BEWARE: If you use a tollway, watch your mail! Your bill may arrive in a plain envelope. And, if you are like me, you may overlook the bill, throw it away and get a second one that DOUBLES the "toll + 50%" that you are already charged for not having a toll tag.
We were prepared for the upcharge when we used the tollway in March. I had done my research and knew the $5 toll would actually be $7.50. However, I forgot to keep an eye out, must have tossed what looked like junk mail and got a bill today for $7.50 PLUS an $8 fee for not paying the first time. DH spent an hour on the phone, spoke to 7 people and finally convinced someone that it really, really was an honest mistake.