1. Fixed transit, preferably rail, above and below ground. Subways along all major travel corridors; buses or trams on all secondary corridors
Fixed-rail transit helps to guide development and keep the streets busy. When development happens around fixed-transit, it is easy to get around on foot because everything is closer together. On the contrary, when transit isn't fixed, as with a diesel bus route, or it is designed around the auto, transit becomes impractical because everything is further apart. New York is an example of a walking city that grew up around fixed transit. Dallas is an example of an auto city built up around roadways. It is very convenient to get around without a car in a walking city built around fixed transit. This makes it so there are more people on the sidewalks, and businesses can thrive from walking traffic, without the need for parking. Fixed-transit can be light-rail, a subway, or a bus that operates from overhead wires. A busway built for diesel buses is also fixed transit, but because the bus can leave the busway it doesn't have the same positive impact on development and density as other forms of fixed transit. If your city doesn't have fixed-transit, advocate for it. It will take a long time to change the way things are built, but a convenient walking district can spring up in little time when fixed transit and high density are established in an area.