What the Environmental Protection agency calls a threat to public health. Vokes wagon accused of making cars that intentionally violate clean air standards. Nearly 500,000 vw and audi diesel cars built in the last seven years include a device that only turns on full emissions controls during official testing but turns off during regular driving. In a statement vw says its cooperating with the investigation. We are a little more than a week out from the popes arri l arrival. Seven days, 17 hours until pope francis lands in philadelphia and today drivers are starting to see the warning signs. The video Message Boards on the schuylkill expressway are reminding drivers about 76 being shut down next weekend. Nbc 10 found these detour signs posted on city avenue indicating some of the closures on the main line. And on the ben franklin parkway crews continue to set up for the meeting of families. Crews also continue to shut down the inner lanes there. Theyll remain closed until tuesday, septe