High albedo concrete is a special type of pavement that reflects more light than dark-colored materials due to its lighter color. This causes the concrete to maintain a lower surface temperature, resulting in less energy needed to cool buildings and less energy consumed by nighttime lighting, not to mention reducing the “heat island” effect found on many asphalt parking lots in the summer. High albedo is especially useful in parking lots and can be used for concrete overlays on roads.
During the day, dark asphalt and building facades absorb light from the sun, turning it into heat and raising ambient temperatures in dense urban areas.
By the time the sun goes down, the heat that was absorbed into the asphalt and buildings is finally released, raising nighttime temperatures higher than they normally would be. This is the essence of the heat island effect.