Tue 5 Jun 2007
THE fundamentals of public transport, complains Martin Lowson, an academic and entrepreneur, have not changed very much since the era of the stagecoach. Passengers wait at an arranged point for a large vehicle to arrive. It then carries them, along with a crowd of strangers, along a fixed route. The meandering course and frequent stops make the trip far slower than it would be in a private vehicle and the odd-looking person sitting opposite makes it less pleasant. But Dr Lowson’s firm, Advanced Transport Systems, thinks it knows how to overcome all this—and give public transport its biggest overhaul in three centuries—using a concept known as personal rapid transit, or PRT.
PRT still involves stations, but they would be smaller and more closely spaced than in traditional transit systems. Instead of big trains or buses, passengers would board small, driverless pods, for one to four people, which would travel along narrow tracks or elevated rails. The stations would not lie on the main line, but on bypasses, allowing pods to proceed directly to their final destination without any stops. It is the stuff of science-fiction films: carefree passengers whizzing effortlessly around in gleaming, automated capsules, without any fear of traffic jams, pickpockets or breakdowns.
In theory, such a system could carry as many people as a more conventional light-rail network or bus service, at lower cost. Since the pods would be much smaller and lighter than trains, they could run on flimsier rails, which would be cheaper to construct. Since they are automated, they could travel much closer together than manually driven vehicles and so get lots of people moving quickly. And since the pods operate only on demand, no money would be wasted on under-used or redundant services. (more…)






