BOSTON - Only 4 percent of Massachusetts adults would feel "very" safe driving through the tunnels of the Big Dig, according to a poll taken in the aftermath of a collapse that killed a motorist. The poll, published in The Boston Sunday Globe, found that 68 percent would feel "not very" or "not at all" safe driving through the tunnels. A combined 69 percent of the 544 randomly selected respondents surveyed in the telephone poll — conducted from July 14 to July 19 by the University of New Hampshire Survey Center — said they would either "definitely" or "try to"...