And I officially found at least two intersections, both on Woodward, that had 12-inch lights prior to 1992. Since at least 1987, the intersection with 16 Mile and the intersection with South Boulevard in Pontiac [[in 1987, the road continuing north was Saginaw Street, it was renamed Woodward in the 1990's) have had 12-inch lights. [[Source: a 1987 documentary posted in another thread)