All right, here is my go at putting a secondary LRT onto Carling Ave, using a side alignment (north side for the most part, but it would be south side at the Civic Hospital).
It requires 32 m of RoW, which means a 2 m increase over what is there right now. That probably isn't too onerous in most places along Carling, most of which would basically amount to expropriating setbacks.
So this is the typical mid-block arrangement, outside of station areas:
Of note is that I have put the bikeway on the same side as the LRT. That is for simplifying traffic signals, since in this arrangement the bikes and the trains operate on the same signal timing
Here is what it looks like at stations, which would also have to be mid-block:
The outbound station simply occupies the sidewalk space. The total width at the platform is in fact a bit wider since part of the platform would be within in the track RoW.
In this case the bikeway "swings out" around the inbound platform.
This is what the cross section looks like at the east side of an intersection:
There is a dedicated right turn lane in the east bound direction to accommodate queuing that may develop as cars wait to cross the bikeway and tracks.
There is a small median between the bikeway and the eastbound lanes since many pedestrians will cross the tracks and bikeway to wait to cross the rest of the street. There is a centre median for traffic signals and as a pedestrian refuge.
Finally, the west side of an intersection:
Essentially the same in philosophy, just that this time it's the left turn movement that has its own dedicated lane for queuing.
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