"The A465 is a crucial artery of our transport network and the principal road link between west Wales and the Midlands, " he said.

BBC: Safety hopes in ?150m Heads of the Valleys road plan

Transport Minister Carl Sargeant called it "a crucial artery of our transport network and the principal road link between west Wales and the Midlands".

BBC: ?150m A465 Heads of the Valleys road project awarded

When hunting for tech stocks, investors should consider not only traditional factors like valuation and income growth, but also the "network effect, " says Kishore Rao, a research principal with Sustainable Growth Advisers in Stamford, Conn.

WSJ: Upside: Why Tech Stocks Look Better��Even for the Risk Averse

Robert Stephenson, son of George and one of the principal figures behind the expansion of Britain's railways, reckoned that a network that was just as productive could have been built for a third less than the actual cost.

ECONOMIST: Booms and busts

The principal one is that the content does not get the best distribution, or the distribution network does not get the best content.

ECONOMIST: One house, many windows | The