1. U.S. Bureau of Transportation Statistics, “Table 1-4: Public Road and Street Mileage in the United States by Type of Surface,” 2015
2. Richard Campanella, “Tracking Bourbon Street's Pedestrian Parade: How Do You Fence a Cloud?,” The Times-Picayune, December 20, 2016
3. Using Google Street View to Audit Neighborhood Environments
4. The Collaborative Image of The City: Mapping the Inequality of Urban Perception