evidence: New Delhi: At least one person was killed and left six others injured after at least 18 speeding vehicles crashed and created a pile-up on the Agra-Noida Yamuna Expressway on Wednesday due to dense fog enveloping the national capital and adjoining areas. [...] Station officer GP Singh of Mahavan police jurisdiction, meanwhile, said, "The trigger of the accident was a defunct car which was rammed from behind by a speeding truck. The truck was ferrying apple cartons and it turned turtle after the collision. Since it was densely foggy morning, over a dozen of cars and heavy trucks kept on piling up on each other in back to back collisions."