References

"Asphalt vs. Concrete: Which Is More Environmentally Friendly?" Asphalt vs. Concrete: Which Is More Environmentally Friendly? N.p., n.d. Web. 25 Nov. 2015.

"Covering New Ground." USSA. N.p., n.d. Web. 25 Nov. 2015.

"Economics." Asphalt Pavement Alliance. N.p., n.d. Web. 25 Nov. 2015.

"Electrically Permeable or Impermeable Interface Cracks." Encyclopedia of Thermal Stresses (2014): 1203. Web.

"Science Buzz." Asphalt vs. Concrete: Potholes Ain't the Half of It. N.p., n.d. Web. 25 Nov. 2015.

"Surfaces | Rails-to-Trails Conservancy." Rails-to-Trails Conservancy. N.p., n.d. Web. 25 Nov. 2015.