In simplicity, roads were meant for transportation not recreation. If they are to be efficient they can't handle mixed vehicles with wide ranges of performance. Imagine the 401 without heavy trucks. Imagine a parallel highway for trucks only.
Side walks: Side AKA the edge of the road and walk AKA go by foot is similar with similar speed differential problems, walk, jog, run, bike and electro toys.
Sharing is good but do we equally share Bloor Street by lane space, 1/3 bikes and 2/3 cars or do we do it by volume 87 bikes / 25500 cars with 0.3% of the width (4") being allotted to bikes?
Side walks: Side AKA the edge of the road and walk AKA go by foot is similar with similar speed differential problems, walk, jog, run, bike and electro toys.
Sharing is good but do we equally share Bloor Street by lane space, 1/3 bikes and 2/3 cars or do we do it by volume 87 bikes / 25500 cars with 0.3% of the width (4") being allotted to bikes?