 Traffic and weather on the 8th. An update now from Rob Stallworth. Traveling downtown, keep in mind the NATO Summit closures are in place and you cannot take the ramp to lower 14th Street or the 12th Street Expressway. Keep in mind Constitution and Pennsylvania Avenues are closed between 9th and 15th Streets. Also, Mass Avenue closed between 11th and 6th Streets. For a full list of closures, go to our website.