It is one of the nodal points on the westward motorway out of London, the M4 corridor, also known as Britain's Silicon Valley.

这里是出伦敦城的西向高速公路上的一个节点——M4走廊，也被称为英国的硅谷。

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Mr Cameron pointed to the planned electrification of the railways in south Wales, cuts to income tax and a commitment to upgrade the M4 motorway.

BBC: David Cameron urges Welsh Tories to fight 'battle of ideas'

Lady Randerson said that until now the Welsh had been "looking over their shoulders with envy" at the relative independence enjoyed in Scotland, as she claimed its Cardiff-based government should be allowed to borrow money to carry out its own major infrastructure projects, such as improving the M4 motorway.

BBC: Devolution in Wales debate

The police watchdog continues to appeal for information from anyone who saw a red Ford Mondeo travelling the wrong direction on the eastbound carriageway of the M4 near the Christchurch Road motorway bridge at around 0315 BST.

BBC: NEWS | UK | Wales | Five M4 crash victims are named