It's about the angle of reflection. When light reflects off a surface, it leaves at an angle equal to the angle it comes in at.
Most of the light hitting the roof will be reflected back up into space. Some small percentage of it will scatter and disperse into all other directions.
If you were in a plane at exactly the right angle between the roof and the sun, you'd see a glare much stronger than you'd see at street level.
Most of the light hitting the roof will be reflected back up into space. Some small percentage of it will scatter and disperse into all other directions.
If you were in a plane at exactly the right angle between the roof and the sun, you'd see a glare much stronger than you'd see at street level.