Is the Silvertown tunnel a bridge to the future or a step backwards?

From high above the Thames, the distinctive portals of the new Silvertown tunnel are clearly visible: a black arch on the North Greenwich peninsula, a green conical building a mile across the water in Newham. On Monday, tens of thousands of cars and lorries will start passing between them, almost directly below the cable car built by Boris Johnson, as if on a mysterious ley line that induces London mayors to embark on unloved transport projects. The Silvertown tunnel, a 0.9-mile, £2.2bn project in what is already one of the most polluted parts of the capital, does not appear an

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