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The problem is that if you remove the traffic jams (which I'm not sure this will even do) then driving becomes more attractive, more people do it, and you get more jams. It's impossible to simply build away congestion. I think Sadiq inherited this project, saw how much it would cost to cancel, imagined the headlines that would cause, and just let it rumble along to completion. Pretty weak Mayoring, IMO. Should have pulled the plug and publicly pinned the huge loss on the Tories.
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The only possible argument about the air quality is probably the current effect of the idling engines stuck either side of Blackwall tunnel
Silvertown tunnel will be exactly the same. Traffic will increase to fill the new capacity, as it always has done, and the average speed of London traffic will remain at around 10 miles an hour: slower than this and people naturally stop driving.
The only possible argument about the air quality is probably the current effect of the idling engines stuck either side of Blackwall tunnel