sentence: Communities are divided up and separated with roads.
sentences_before: Traffic congestion and accidents can be dangerous to other road users, for example people riding bicycles or walking, especially in an old town built when cars were few. Some 20th century towns are designed for cars as the main transport, but this can cause other problems. These include even more pollution and traffic, as everyone has to drive.
sentences_after: People walking are in danger by expressways with too few foot bridges, small road bridges or other crossings. Designers now understand these problems and try to build more balanced systems.
concept_name: community
headings: Car Disadvantages
categories: Automobiles