Phoenix is one of the hottest cities in the United States, so in 2020 the city tried a new way to cool things down. Rather than plain black asphalt, the city painted some roads with a light-colored, reflective coating, on the theory that a lighter road would keep cooler. A year-long study was performed by Arizona State University (ASU) to test this, and the Cool Pavement Pilot Program report summarizes the results.
What Phoenix actually did
