Now that Quinton Higgins has the future of his own children to worry about, he spends more time thinking about the 1988 Carrollton bus crash that he survived. Twenty-seven people perished on that dark interstate. A documentary, “Impact: After The Crash,” has started production and is expected to be released prior to the 24th anniversary of the nation’s deadliest drunken-driving crash on May 14, 1988.