 Headed south on the BW Parkway past Powder Mill Road. There was also an incident near Nassau Goddard, but looks like that's been taken care of. Route 1 still crowded between about Conti and Cherry Lane. That's as folks leave the fireworks. Northbound and southbound 270 very slow. Caller says northbound 270's got the crash blocking the left lane right by the exit for Urbana.