Some traffic systems, such as red light timing, actually have been shown to increase accidents. But they also increase revenue edit: source that I haven't read

Some traffic systems, such as red light timing, actually have been shown to increase accidents. But they also increase revenue edit: source that I haven't read, but there are numerous sources from a simple web-search: http://www.illinoisherald.com/articles/2014/q4/chicago-red-light-cameras-increase-accidents/ http://www.illinoisherald.com/articles/2014/q4/chicago-red-l...