The color of the pavement surface tends to change over time due to weathering and traffic. Fig. 10 shows the albedos of nine test sections at different times after construction. These nine test sections are constructed for testing and were not open to any type of traffic. As noted, the albedos of concrete pavements (C1-3, although albedos of C1 and C3 increase slightly in the first month) and interlocking concrete pavers (A1-3) generally tend to decrease over time; in contrast, the albedos of asphalt pavements (B1-3) increase slightly over time. The change in albedo mostly happened in the first month just after the construction due to weathering. Under both continued weathering and trafficking, the change of albedo is expected to be larger, and for concrete and especially asphalt, traffic will wear the binder (cement or asphalt) off of the surface aggregate which will result in albedo being influenced by the reflectivity of the aggregate.