As vital organs of the city, streets and sidewalks not only move people but bring them together. When well designed and operated, they support commerce, encourage social capital, enable healthy behaviors such as biking and walking, and produce cleaner air. Conversely, these vital organs, when poorly designed or managed, can encourage activities that result in substantial negative externalities, including increased safety concerns as cars collide with bikes and scooters with pedestrians.
Goldsmith, Stephen, and Betsy Gardner. "Prioritizing Public Value in the Changing Mobility Landscape." HKS Faculty Research Working Paper Series RWP20-005, February 2020.