The science of sight can teach motorcyclists how to become more visible. Robert Poulin, MD, an eye physician and surgeon who club races a BMW M3, shares some surprising facts. “As people age, the eye begins to block light, particularly in the blue end of the color spectrum,” he says. “So a blue bike or apparel won’t look as vibrant to older drivers as greens, reds and yellows.” Another surprise is that riders may be more visible at night than by day. “The dark-adapted eye is very sensitive and has a wider dynamic range for detecting light than the light-adapted eye,” Poulin notes. And finally, get a headlight modulator. “As a driver, I really notice bikes’ flashing headlights,” he says.