Widening lanes increases the perceived safety... and so drivers feel it is safe to go faster. Higher speeds encourages dangerous driving. It is widely accepted that cars will travel as fast as they can go until perceived safety begins to decrease. By reducing the speed of the Jolley Cut to 40km/h and narrowing lanes, it will ensure cars don't have a perceived sense of safety above this speed. Therefore they will in fact travel the speed limit and it will be safer for ALL forms of transportation: bikes, pedestrians, cars, etc.
Widening lanes and eliminating sidewalks was en vogue in the 1950's.... what year is it again?