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City and Regional Planning QUESTION #4989
Question 1
What does the 'Marchetti constant' suggest about urban form?
  • Cities should be circular
  • Average commute time remains stable at ~30 minutes✔️
  • Population density decreases exponentially
  • Building heights should be uniform
Correct Answer Explanation
Cesare Marchetti observed that throughout history, people budget approximately 30-60 minutes (average ~30) for one-way commuting, regardless of transportation mode. This constrains city size and influences urban sprawl patterns as speeds increase.