Did you see that the Egyptian government is contemplating a redevelopment plan in downtown Cairo which would transform the area into a pedestrian-only area?
Check out: "The Boursafication of Downtown" (or
مخطط شامل لتطوير «وسط القاهرة» خلال ٣ شهور.. ولجنة لإعداد «قانون العاصمة» if you read Arabic).
It'll be interesting to watch this develop, as Cairo was by far the dirtiest and loudest city I've ever been to - or even imagined ...