It's also safer. I won't even go near Barlow/16th during a rush hour, as you are taking your life into your hands when you try to merge into that mess.
It is not the goal of every interchange to make both roads free flowing. As in the case of Glenmore and Elbow, the goal was to make Glenmore free flowing, not Elbow. That said, despite the fact that there are now four lights in about 500m on Elbow, the road now flows much, much better than it did before the interchange was complete. This is specifically for the reason Ironhorse said. The lights are now tuned to the benifit of drivers on Elbow, not drivers on Glenmore.
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