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Volume 928: debated on Monday 21 March 1977

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asked the Secretary of State for Transport what criteria he uses to determine the economic value of a motorway; and at what point or points a motorway scheme is deemed economically non-viable.

Cost-benefit analysis can be used to quantify some of the benefits of a road scheme, while others must be assessed qualitatively. A scheme is considered non-viable if, taking all factors into account, benefits appear insufficient to justify the costs.