[Retric]

Skyways seem like a better alternative as you increases throughput for both pedestrians and cars.

https://en.wikipedia.org/wiki/Skyway EX: https://en.wikipedia.org/wiki/%2B15

Alternatively, you one or both can go underground. (https://en.wikipedia.org/wiki/Underground_city#United_States) Crystal City VA for example has a huge underground mall that almost completely removes pedestrian tragic outside and connects to the subway system. Sadly, it's not a strait path, but there are ~50 buildings connected and it becomes really useful if you live and or work in the area. (http://www.thecrystalcityshops.com/_files/docs/cc-shops-2014...)

[bryanlarsen]

If we had to lower the speed limit to 30kph wherever cars & pedestrians interacted (aka all streets), then magically there would appear money to build separated pedestrian infrastructure like skyways so that politicians could drive faster than 30kph on their routes.