If we could get the TVM cost down to maybe $5000 or less, we could really scale up proof-of-payment and speed up our system. Of course, this would necessitate quarter-mile stop spacing too
but we could do 16 or more TVMs for the cost of one LRT TVM.
I actually wonder if there's a way to analyze how much dwell time is spent dealing with payment, etc. And how much time could be saved with proof-of-payment. This would be especially critical for rush-hour services and busier routes, since we could do all-door boarding. It would reduce the bus-and-driver time to accomplish the same route, so maybe there's a case to be made for TVMs/POP on some routes today if the price is right.