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Lane Width Reduction <br />Speed <br />Effects on <br />•Highway Capacity Manual (1994): <br />–1.9 mph reduction from a 12-foot lane to an 11-foot lane <br />–6.6 mph reduction from a 12-foot lane to a 10-foot lane <br />*These values are not reported in the 2000 HCM because <br />of a change in analytical methodology <br /> <br />