When Signal Lancer (the traffic signal Autobot) switches his light colors, and when Lori teaches the Autobots the rules of the road, the green traffic light is blue. This color conundrum is an odd Japanese cultural tic based on the fact that for a large part of the Japanese language's history, they used the same word, "ao" for both blue and green. Although a separate word for green was established in the language ("midori"), "ao" is still widely used to describe both shades of blue and green.