IMO the only way to help alleviate the congestion on Eglinton, specifically around the intersection of Eglinton and Allen is to create a way for both surface level pedestrians and transit users to navigate through this intersection underground or above ground not impeding the flow of traffic wanting to go Northbound on the Allen. This would increase the amount of cars that can get onto the Allen and ease the gridlock in this area. I know EglintoTOday is looking at options on how to ease congestion in this area but honestly a lot of it might be band aid solutions.
I continue to be of the opinion that the long term solution is the remove of the Allen. But due to cost, that's not on the table in the near term.
The short-term solution is to begin to phase down the volume of cars. This would be best achieved by removing SB access from Lawrence (do you really need the Allen to get from Lawrence to Eglinton? ) and for the same reason, the NB exit to Lawrence should also removed. This would benefit Lawrence far more than Eglinton, but it would reduce total traffic volume by maybe 10% and also smooth it a bit which would have some secondary benefit at Eglinton.
That, along with the opening of Crosstown (one day) should actually achieve a fair bit of positives. The opening will see a sharp reduction in buses on Eglinton, that will reduce traffic and complexity, in combination with the changes to the Allen I propose, I think we can probably get a 15% improvement in operational efficiency and a modest reduction in conflicts.
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I would then propose to change the configuration of the two Allen/Eglinton interchanges slightly.
First the west one.
The width for the road here isn't totally unreasonable, though I'd be tempted to pinch it just a bit. But, the bus roadway is to too wide. It seems to be predicated on a bus turning from the east and the west at the same time. Which just doesn't happen much as there's too much risk with the wide right turns required.
The roadway is over 8M wide, I would cut this to 4.5M and add 3.5M to the island, which I would also bring forward into the crosswalk. the result would be to make left turning vehicles take a slower, more predictable turning movement and also to allow pedestrians have safe refuge between the bus access and the ramp, which would be over 5M wide.
Over on the east side:
The combined 2-lane on ramp is over 13M wide, when there is no real need for it exceed 8M. Narrowing the lanes and the crossing distance would make turning movements more predictable, reduce pedestrian crossing time and associated conflicts, actually making turns easier/smoother for motorists.
Some engineers would make a face at the turning radii I'm allowing for trucks.....but I think its perfectly workable. At the very least its certainly possible to narrow this opening. The more narrow, the greater the benefit.