 The worst of it on the Beltway is in Montgomery County. Interloop jammed from Bethesda through Silver Spring, all because of a broken-down minivan. That's all it took beyond University Boulevard. At Northwest Branch, it stalled in one of the center lanes. 270 and 95, not too bad. BW Parkway, heaviest near Fort Meade and 32. 50 is great at the Bay Bridge. In Virginia, on the GW Parkway, the reminder that