Asphalt, the sticky stuff used to pave roads, comes from the “bottom of the barrel” of crude oil, what remains after gasoline and other substances are removed. There’s currently an asphalt shortage that has delayed road repairs across the U.S. Two factors are cited. One is oil refineries installing cokers which can refine lower grade crude oil into gas and diesel, bringing in more profits than asphalt leftovers. Second, refineries have also cut back production of a polymer that’s added to asphalt to increase durability. Concrete producers may find their pricier alternative becoming more in demand for roads.