Sierra Club wants halt to freeway widening By KEN RITTER Associated Press writer LAS VEGAS -- Arturo Tapia is among the people the Sierra Club thinks could be sickened by increased pollution if a key Las Vegas freeway is widened from six to 10 lanes. Tapia, 28, a painting contractor, said he and his mother and 12-year-old sister have grown accustomed to living next to one of Nevada's busiest roads. "Always noise," he said of U.S. 95, where Tapia can see traffic whiz past a low block wall separating his back yard from the freeway. "But it's something you have...