jasdmd0

Most of it is safety, since if you've ever seen the tolls on the Mass Pike, especially at the Rte 128 interchange, or Exit 9(I-84 interchange) when the lines for the cash lanes are long, many, many folks without fastlane transponders will inadvertantly(or ignorantly may be more appropriate) head down the Fastlane lane because there is no line and then they've got to try and merge into the stopped cash lanes. If you're crusing through a fastlane lane and that happens infront of you, trouble(and I don't car how well they've marked the Fastlane only lanes, many people without fastlane/EZ pass transponders will do this).

Personally, If its wide open and not very crowded in the adjacent lanes, I'll cruise through at 20-30mph, no problems, the Transponder always reads the signal.