This is probably following the line of a main road or a railway. Many people now choose to live and work outside the city on the urban fringe - a phenomenon that is not reflected in the Burgess model. Note how the low quality housing is next to the industrial zone, middle class next to low class and high class as far as possible from industry and low class.
New working and housing trends have emerged since the model was developed. Zone 2: Inner city area twilight zone. Transition zones exist between the mainly high class and low class residential areas.Explanation: Hoyt's model came nearly twenty years after Burgess'. The high-class residential areas of the city fan out from the city centre to the elevated area of Zona Alta in the foothills. Many will have electricity, water supplies, even schools and clinics. This could have been via a redevelopment scheme as outlined in the problems and solutions scheme. For example, a 'high class' sector would remain high class as it would be the most desirable area to live, so only the wealthiest could afford it. Industry and low-class residential areas are located along the coast or the two river valleys that provide access to the city through the coastal mountain range. Industry will also feature in this area. These will be the oldest shanty towns in the city and are located here so that residents could find work in the CBD or in the homes of the higher-class residents. The main characteristics of the model of Sao Paulo below are: 1.
Zone 3: Low class residential. Transport is much more readily available allowing more people to commute.