NEW YORK (AP) -- A racehorse kicked through the floor of a trailer on an expressway on Wednesday, injuring itself and snarling traffic. A motorist saw the horse's hoof sticking through the trailer around 4 p.m. and got the attention of the trailer's driver, who pulled over to the side of the Cross Bronx Expressway. Traffic was stopped as a veterinarian examined the horse. The horse, a 3-year-old thoroughbred gelding, was euthanized around 6 p.m. at the Belmont Park Raceway in Elmont, said Joe Pentangelo, a spokesman for the American Society for the Prevention of Cruelty to Animals. Three other...