Growth takes place evenly in all directions. This seems most sensible for a city, assuming that people want to live close to other people and services. This pattern does not usually happen. Transportation routes aren't always equally built. Might occur at the intersection of two major railroads or highways.
Growth takes place faster and farther along the railroad or highway.
Assumes some kind of barrier to the left of the original settlement. Have students look at their own city and choose the pattern that best describes their city and apply the questions in 4b. Where do people tend to live in urban areas. The three models are the concentric zone, sector, and multiple nuclei. Have students look at the city from 2a.