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Maybe, but it's an interesting concept.

My city put bridges over a lot of the major roads for people to cross. A few roads have a tunnels underneath as well.

I imagine you don't even have to put too many of them in, before any pedestrians give up and drive---having tired of needing to climb and descend four flights of stairs or, worse, walk an extra block along ramps, just to cross the street.

Make the whole city 20mph max? Fine by me :)

If I'm in a car, I'd like to not brake-accelerate-brake-accelerate but rather move in a constant tempo. If I'm a pedestrian, I'd like a car-less safe environment to walk.