Scarborough has many of the streets with no sidewalks.  They are fine most of the time, but are scary for young kids learning to ride a bike.  Most drivers slow down on them, but some do not.  I don't see this as a progressive model in any way.   I think sidewalks are safer for kids and the elderly.  Complete streets are going to be an interesting experiment in Toronto the severely congested.   Complete streets over a subway, great idea.  Complete streets with on-street giant streetcars and a single car lane in each direction, will be slow and congested.  Spadina is a slow street for pretty much all the travel modes.  Is this what we want all over the city?