Porous asphalt is an environmentally friendly tool for stormwater management.

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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.	A smooth pavement maximizes tire contact, providing more traction.	Wisconsin researchers installed traffic and environment sensors and a real-time wireless data feed on a portion of Interstate 43 that features Perpetual Pavement.	For pavement designers, the APA offers two versions of its software for the design and analysis of Perpetual Pavements. Both versions of the software are available as free downloads.
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