My opinions about PRT reflect the position of mainstream transit advocates in Minnesota such as the Sierra Club North Star Chapter . It is reasonable and moderate to rely on facts instead of conjecture. PRT does not exist in revenue service anywhere in the world. Any claims about PRT are merely conjecture, not fact.  Any comparisons between PRT and other proven modes of transport is meaningless, unless the purpose  is to mislead. What I have successfully proven in print and on the internet is that many PRT advocates use "facts" based on conjecture that PRT can out-perform conventional, existing modes of transport to argue that public funding for transit is wasteful. You can see that for yourself in this video made by a PRT advocate.. One PRT "fact" often repeated by advocates in public meetings is that PRT can pay for itself out of fair-box revenue - you can hear that in this video and this video. Perhaps you can find a peer-reviewed article that gives an explanation how PRT can "pay for itself". I have been unable to find any authoritative explanation how PRT can operate without public subsidies. Thank you.