> They may simply move traffic onto a different road, increase congestion there and so move pollution. Temporarily maybe, but eventually people who don't really need to use their vehicles for those journeys stop using them and seek alternatives, and we drop down to the previous levels of vehicle usage (that still causes significant transit delays) for those that do have a more compelling reason to be driving.Traffic is dynamic and fluid. If you increase capacity more people will start to use their vehicles because capacity is increased, journey times drop, and the journey is not outwardly "horrific". However, the increased volume means it eventually settles to an equilibrium at roughly the same "normal" and now you have more people who will tolerate the same transit times as before. Increased capacity rarely leads to reduced transit times at peak usage.Likewise, if you remove capacity then, eventually, demand drops too, and things eventually return to the same levels.The problem with modern driving is that sat-navs have started to game the system and direct people off the main arterial roads into the residential roads as this doesn't require cab-driver like knowledge of back roads. But the same eventual bottlenecks are present (e.g. single lane Upper Richmond Road through Sheen, West Hill dropping to one lane, etc), or other things like Hammersmith (and now Wandsworth) bridges being shut. Eventually the traffic bunches up somewhere and it's even worse than before as there are now 12 extra side roads all full filtering into the same arterial road.These roads that are now being swamped were never meant to carry commuting traffic. Many of them are roads past schools for example. Some people can't see the problem with this and think that this is fair game and that all roads are equal and that all roads should be able to carry the full weight of vehicles. Good luck to them, but they're going to find things increasingly annoying in the future as the country (and councils and Government) realise this is unsustainable.LTNs are one tool to help redress the balance and reduce the capacity of the residential road network, which puts off people from using their vehicles (ideally those that are choosing to use their vehicles, rather than not having a choice). They'd be less necessary if people weren't as selfish with their transport choices.We'll see what the "independent" LTN review discovers (if it ever happens, the cynic/realist in me suggests that Sunak has just put it out there in the papers to help lather up the various wet Tories and that no official review will ever occur) and I'm sure that, if the review does occur and publish any findings, that each opposing side will decry it for any number of reasons - including bias and political alignment. Such is life, but LTNs are more than likely to stay, and will probably be on the increase in the future so get used to them.
John Kettlekey ● 916d