A Modesto, California study found that asphalt on streets shaded by large canopy trees lasts longer than asphalt on unshaded streets, reducing maintenance costs by 60% over 30 years.
McPherson, E. Gregory, and Jules Muchnick. (2005). Effects of Street Tree Shade on Asphalt Concrete Pavement Performance. Journal of Arboriculture, 31(6), 303-310.