Quote:
Originally Posted by CoryB
It is actually surprising to see CCW had some design compromises built in that could be very dangerous in the long term. The south to east and west to south traffic actually need to cross and share a single lane. In the initial design they likely could have pulled the west-south loop further north and run the south-east traffic under it and then over CCW and into a loop. Now the only fix, if it would even be possible, would a full on stack style design but considering it would need to accommodate large trucks it would be a huge undertaking.
The other compromise on CCW is in south-west traffic pattern. Considering the size and scope of that whole interchange it is surprising to see the south-west flow needs to make a left turn with potentially four lanes of through traffic. It might be possible to fix that one longer term if warranted but would still be somewhat awkward to retrofit.
Of course the thinking in the design at the time is that south-east and north-west flows will always have minimal traffic.
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The current weaving of the two ramps is rather difficult to eliminate without elaborate ramps. That's why they put those merges on the separate lanes. They're separate from the through lanes where people are travelling at speed. This is typical at other locations, such as 101/7 and 59/100.
The new 59/101 interchange would be a very similar set-up to the completed 101/CCW interchange. They would add loops, or a loop and a flyover in the ultimate case, in the future for the north-west and east-north movements. I think there are plans to have a fly-over ramp for the north-west movement when the project is completed, if ever. That would maintain traffic at speed through the interchange. May even be a two lane fly-over similar to what's at Bishop and Route 90, although they already built a single lane bridge for the exit ramp... The Headingley bypass would be the main Trans-Canada route, so keeping speeds at 100km/h, or 110 km/h, is preferred. Maybe this is why they left out those ramps and didn't construct the 4th bridge yet, like they did for the rail overpass. The unused bridge from nowhere.