section_path: Classifications/Complementary
section_name: Complementary
paragraph_text: Complementary
  
  Complementary infrastructure refers to things like light railways, tramways, and gas/electricity/water supply. To complement something means to bring it to perfection or complete it. Complementary infrastructure deals with the little parts of the engineering world that make life more convenient and efficient. They are needed to ensure successful usage and marketing of an already finished product, like in the case of road bridges. Other examples are lights on sidewalks, landscaping around buildings, and benches where pedestrians can rest.