Traffic on Baltimore?s Beltway could slow to a crawl Wednesday night as crews blast through underground rocks to make way for a new sewer line in Towson, state transportation officials said.

Maryland?s State Highway Administration will implement a “rolling closure” on Interstate 695 between York and Dulaney Valley roads beginning about 10 p.m., said agency officials. A private contractor installing a new sewer line has until 4 a.m. Thursday to complete the work, but could finish earlier, said Charlie Gischlar, an SHA spokesman.