London Evening Standard/Boston

Motorists will have to pay to use a new road tunnel that could replace the decaying Hammersmith flyover, it emerged yesterday.
Boris Johnson said that introducing a toll — expected to be about £2 per car — would be an important way of raising funds for the project.
It came as the mayor revealed detailed plans to improve the capital’s road network by putting some of the most congested routes underground within 10 years.
Five pinch points - including at  Hammersmith, Barking Riverside and New Southgate - would be tunnelled, freeing up land for parks and public spaces as well as development.
Millions of pounds have been spent patching up the Hammersmith flyover, which is used by 90,000 vehicles a day.
It was shut to all traffic shortly before Christmas 2011 — leading to traffic chaos in west London — before being partially reopened a few weeks later.
Johnson announced a feasibility study into the proposed road tunnels as he visited the Big Dig tunnel in  Boston which carries an eight-lane highway.
The US scheme has reduced traffic congestion and created space for parks and public spaces. However, it faced criticism for running nine years late and $20bn over-budget.
It divides Bostonians and is dubbed “America’s greatest highway robbery” by some critics.
City Hall aides said the mayor was confident a London version could be delivered on time and on budget, and cited the Olympics and Crossrail as examples of the capital’s ability to deliver major infrastructure projects.
Johnson said: “There’s no question that things did go wrong here. It did go over-budget and it did take too long, but look at it in the end. It is an Elysian park in the middle of what was a gigantic flyover.”
He said funds could be raised in London by releasing land over the tunnels for development, although in the case of Hammersmith there would be open space to reconnect the town centre with the Thames too.
The mayor has already said he would like to see the North and South Circulars go underground, either in the form of an inner orbital route or two cross-city tunnels.
He added: “Rebuilding some of our complex and ageing road network underneath our city would not only provide additional capacity for traffic, but it would also unlock surface space and reduce the impact of noise and pollution.”