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To ask Her Majesty's Government what evidence they use to inform policy about vehicle (1) speed limits, and (2) emissions; and what assessment they have made of the emissions levels of (a) petrol, and (b) diesel, vehicles between 1,000–3,000cc travelling at a constant speed of 20mph in (i) first gear, (ii) second gear, (iii) third gear, (iv) fourth gear, (v) fifth gear, and (vi) sixth gear.
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