Commuters in Washington DC are being urged to plan ahead as a major road closure will impact traffic in the downtown area on Wednesday, September 24. The closure is scheduled to allow for the annual testing of the flood protection levee system along 17th Street in northwest DC. According to officials, 17th Street from Constitution Avenue NW to Independence Avenue SW will remain closed from 5 a.m. until 2 p.m. while the tests are conducted. The levee is managed and o