By Getty Images Scotland’s capital city boasts a 40% reduction in collisions since the introduction of a new 20 mph speed limit (equivalent to just over 30km/h). A study shows that this measure has also reduced the number of road deaths by almost a quarter. Scotland’s capital city boasts a 40% reduction in collisions since the introduction of a new 20 mph speed limit (equivalent to just over 30km/h). A study shows that this measure has also reduced the number of road deaths by almost a quarter. A study published by the University of Edinburgh demonstrates the effectiveness of reducing speed li…