Porous asphalt is an environmentally friendly tool for stormwater management.

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With porous asphalt, deicing chemicals can be reduced by 75 to 100 percent.	One of the earliest examples of a porous asphalt pavement is the parking lot for the visitor center at Walden Pond State Reservation in Massachusetts, which was constructed in 1977.	Crushed concrete is rarely used as aggregate in asphalt pavement.	When a Perpetual Pavement needs rehabilitation, road crews mill off the top layer for recycling, then put a new surface on the road.
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