No need to be alarmed if you notice smoke and sirens coming from the George Washington Bridge tonight, though commuters might not have a fun time. The Port Authority is conducting a full-scale emergency response drill on the GWB's lower level, which will be closed in both directions.

Reports say the Port Authority will be simulating a fuel tanker explosion complete with crashed cars and emergency vehicles; the drill starts at 9 p.m. tonight and runs until 8 a.m. tomorrow morning. "The exercise is part of the agency’s ongoing drills, which enable the Port Authority Police Department, agency personnel and other emergency responders to test and enhance response procedures," the PA said in a statement on Thursday. Overnight bridge travelers will be redirected to the upper levels.