...A debate over whether to place speed humps on North 35th Street in Arlington County has generally pitted the families in the modest brick ramblers in one neighborhood against the empty-nesters living in the white-columned homes of another. The parents say their kids need safer streets; the other side says the humps are unsafe. Herring describes the pitched battle as "class warfare at its worst." Community meetings have turned into shouting matches worthy of Britain's House of Commons. "Keep Kids Alive -- Drive 25" signs have been stolen from yards. Fliers and counterfliers are flying. A signature drive was launched....