http://www.calrecycle.ca.gov/tires/RAC/ http://www.calrecycle.ca.gov/tires/RAC/ "Rubberized Asphalt Concrete". You're reusing discarded tires (which are extrem

http://www.calrecycle.ca.gov/tires/RAC/ http://www.calrecycle.ca.gov/tires/RAC/ "Rubberized Asphalt Concrete". You're reusing discarded tires (which are extremely painful to recycle) and extending the lifespan of the road. Not quite sure if the material in tires is actually rubber or some synthetic petroleum product, but I think the principle is the same.