None of the high tech solutions are better than stop gaps.
Sherwood Botsford

This idea has been around a couple of decades ago as part of the car-centric city. It’s terrible for a couple of reasons​ like congestion, the absence of trees, no light in the lower corridor, and the fact that pedestrians and cyclists would have to go up and down when they move through the city.

The most liveable cities in the world today have a lot of people walking, cycling and using public trains and buses and a decrease of car usage.

Actually, with less cars junction design is a lot easier.