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<p>The Department published a comprehensive three-year evaluation of the effect of
20mph signed-only limits on 22 November 2018.</p><p> </p><p>The research substantially
strengthens the evidence base on perceptions, speeds and early outcomes associated
with 20mph speed limits, and is the only major UK study to consider multiple case
study areas and provide a national view.</p><p> </p><p>The headline findings were:</p><ul><li>20mph
limits are supported by the majority of residents and drivers.</li><li>There has been
a small reduction in median speed (less than 1mph).</li><li>Vehicles travelling at
higher speeds before the introduction of the 20mph limit have reduced their speed
more than those already travelling at lower speeds.</li><li>There is insufficient
evidence to conclude that that there has been a significant change in collisions and
casualties following the introduction of 20mph limits in residential areas.</li><li>In
one city centre case study there has been a significant reduction in collisions and
casualties.</li></ul><p> </p><p> </p>
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