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

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

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The principal originating source is the emissions from road vehicles.

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"Bradley will return to the United Kingdom for treatment and to rest and we hope to have him back on the road as soon as possible, " continued Brailsford, who is also team principal of British Cycling.

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