Traffic lights have a specific design and orientation which makes it easier to identify which light is on. Plus, they're up on poles or other places around the

Traffic lights have a specific design and orientation which makes it easier to identify which light is on. Plus, they're up on poles or other places around the road. By comparison, the picture in the linked story shows lights that are more or less in the same location as other lights on a car. If you have a difficult time distinguishing color and you look at them while driving or walking, it seems plausible that they'd be harder to distinguish. I realize there's different types and severity of color blindness, but using color alone (or primarily) seems like not the greatest usability choice. I did consider these things when commenting.