So I will be driving into houston coming in from west on I-10, going to IAH, I will be taking Sam Houston Tollway. Question is how do I pay toll? Last time I went there I don't remember encountering any manned toll booths, I do not have EZTag, so how the hell do I pay toll? will then send me the bill in mail? or are there manned toll booths? maybe on the airport off ramp? is there some other way?