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Originally the word “street” simply meant a paved road (Latin: “via strata”). The word “street” is still sometimes used colloquially as a synonym for “road”, for example in connection with the ancient Watling Street, but city residents and urban planners draw a crucial modern distinction: a road’s main function is transportation, while streets facilitate public interaction.1 Examples of streets include pedestrian streets, alleys, and city-centre streets too crowded for road vehicles to pass. Conversely, highways and motorways are types of roads, but few would refer to them as streets