If you’re comfortable with the present green, amber, and red traffic lights, be prepared to get uncomfortable. New research suggests that adding a white light will speed up traffic and improve safety for both cars and pedestrians.

Red for stop, green for go, and amber for prepare to stop (or stomp on the accelerator, if you’re like some drivers). It’s been that way since the 1920s and is even codified by an international treaty to make sure accidents don’t occur because a London driver doesn’t understand signals in Tokyo.