I don't think anyone is trying to claim that Morgan wasn't a skilled inventor, but even the article you linked to states that he didn't invent the first traffic light, but rather he improved upon it. Prior to Morgan's invention, most of the traffic signals in use featured only two positions: Stop and Go . . . The Morgan traffic signal was a T-shaped pole unit that featured three positions: Stop, Go and an all-directional stop position. The third position halted traffic in all directions before it allowed travel to resume on either of the intersection's perpendicular roads.
Wikipedia certainly needs to be approached with a certain amount of skepticism, but in this instance there are 36 references, and almost all of them have hyperlinks to view the original source material. Many of these are from foreign sources, and I can't imagine why they would care to fabricate such information.
**Edit: I think that Graeme and I must have posted within seconds of each other. Sorry for the nearly identical content.**
(Message edited by hydrargyrum on September 08, 2011)