What depending on whether change the brightness of the object?
First of all, what some of change the color of the object? It depends on the amount of reflection.
As shown in the figure above, be of the same color, it looks bright with the amount of reflection is large, it looks dark and small.
How do the road look to?
As I said in diffuse reflection of light, such as dry ground it will diffuse reflection because it is bumpy.
In the figure above is diffuse reflection, the ground is also visible from any direction because they diffuse the light.
RoadA
2015 身の回りの光と色の現象