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Unique pedestrian crossing in Burnt Oak
"Richard Buttrey" wrote in message ... On Sat, 3 Jan 2004 09:47:35 -0000, "Paul Oter" wrote: "Aidan Stanger" wrote in message The big mystery is why so few crossings in London are marked like that. Space is such a constraint that most of London's signalled crossings use the Barnes Dance sequence UIVMM. I suspect the main constraint is that a diagonal crossing, being a greater distance, requires vehicle traffic to be stopped for longer than with an ordinary orthogonal crossing. So it's pedestrian convenience vs motorist convenience. PaulO An optimal phasing for a number of pedestrians would surely depend on where pedestrians are trying to get to, and the relative numbers wanting to make a simple orthogonal move and those wanting a diagonal move? If all pedestrians wanted to end up on a diagonally opposite corner, then one diagonal move as opposed to two orthogonal moves would result in a shorter overall crossing time and obviously a shorter stopping time for motorists. That would be the case if the traffic planners calculated the length of the pedestrian phase on the basis of the time taken to cross two arms of the junction. In practice, they are likely to only consider the time taken to cross a single arm of the junction. PaulO |
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