A New Tar Road Is Black In Colour, And The Colour Lightens Or Turns Grey After It Is Used For A While. Why Is That So?

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Wendy Profile
Wendy answered
One of the reasons could be that dirt gets on the road and lightens the appearance of it.
The sun is also responsible for lightening the colour of a paint job on a car if it's in the sun too long. It's possible that because the road is black it attracts the suns rays even more and is lightened due to intense exposure.
thanked the writer.
Joanna Tay
Joanna Tay commented
Do you think that the same 2 roads laid at the same time but at different places, one in the tropical country and another in the Northern/ Southern part of the globe where there're less sunlight, would make any difference to the result? Suppose other things remain constant.
Wendy Profile
Wendy answered
There are different elements depending on where you live: intense sun exposure, dust, dirt and pollen, normal wear from the road being used. As the road is travelled the tar is compressed by the weight of the vehicles. But I'm not sure if this would have any affect on the colour or not. Yes. I think that 2 roads constructed of the same material in 2 very different parts of the world would show different signs of ageing/wear.

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