Was on the NJ parkway and was wondering, why it’s not smooth. The roads pavement kept alternating between a smooth asphalt to a rougher substance, probably concrete. Maybe I’m using the wrong term but I’m curious.
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Concrete and asphalt are both used for different types of roads.
Asphalt is the most common and is that dark color. It is cheap and 100% recyclable. (You can literally just heat it up and re-pour it.) It is however not too durable.
Concrete is very expensive and it takes days to cure, but it is strong. You usually use it in cities or interstates with high traffic. Those are the light gray roads.
I imagine what you’re describing is concrete road, but it is damaged. They probably filled in the gaps with asphalt instead of concrete. This is because asphalt is way cheaper and can be poured and dry in less than a day. Concrete has to chemically cure and the road would be closed for days.
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