Editing Personal rapid transit (section)

===Technical feasibility debate===
[[Vukan R. Vuchic]], professor of Transportation Engineering at the [[University of Pennsylvania]] and a proponent of traditional forms of transit, has stated his belief that the combination of small vehicles and expensive guideway makes it highly impractical in both cities (not enough capacity) and suburbs (guideway too expensive). According to Vuchic: "...the PRT concept combines two mutually incompatible elements of these two systems: very small vehicles with complicated guideways and stations. Thus, in central cities, where heavy travel volumes could justify investment in guideways, vehicles would be far too small to meet the demand. In suburbs, where small vehicles would be ideal, the extensive infrastructure would be economically unfeasible and environmentally unacceptable."<ref name="vuchic">{{cite web
 | last=Vuchic | first=Vukan R
 | url=http://faculty.washington.edu/jbs/itrans/vuchic1.htm
 | title= Personal Rapid Transit: An Unrealistic System
 | date=September–October 1996
 | work = Urban Transport International (Paris), (No. 7, September/October, 1996)
 | access-date = 30 August 2017
}}</ref>

PRT supporters claim that Vuchic's conclusions are based on flawed assumptions. PRT proponent J.E. Anderson wrote, in a rebuttal to Vuchic: "I have studied and debated with colleagues and antagonists every objection to PRT, including those presented in papers by Professor Vuchic, and find none of substance. Among those willing to be briefed in detail and to have all of their questions and concerns answered, I find great enthusiasm to see the system built."<ref name="vuchic"/>

The manufacturers of ULTra acknowledge that current forms of their system would provide insufficient capacity in high-density areas such as central [[London]], and that the investment costs for the tracks and stations are comparable to building new roads, making the current version of ULTra more suitable for suburbs and other moderate capacity applications, or as a supplementary system in larger cities.{{citation needed|date=August 2017}}