Virginia Gov. Bob McDonnell on Tuesday said he will ask Defense Secretary Robert Gates to voluntarily delay the Army’s move into new office space in Alexandria until traffic problems at the site can be addressed. McDonnell’s announcement came just hours before the Fairfax County Board of Supervisors concluded that it doesn’t have the legal authority to challenge in court the Army’s shift of 6,400 defense workers to the Mark Center near the intersection of Interstate 395 and Seminary Road this September.

Local officials said the additional commuters on what are already heavily congested roads will likely cause gridlock.