A truck driver from West Bengal was killed when a granite block from a truck that rammed another vehicle from behind fell on his cabin on the Khammam–Devarapalli Greenfield Highway in Wyra mandal. Khammam: A truck driver was crushed to death in an accident on Khammam–Devarapalli Greenfield Highway at Snanala Lakshmipuram village in Wyra mandal in the district on Tuesday.