Bikelight speed; the analogy scaling the solar system down to where the Earth is represented by a 12 inch globe and by using the same scaling factor, scaling the speed of light to 16 mph. Therefore when you are biking at 16 mph, are going bikelight speed. Try a little science experiment. Place a 12 inch standard globe of the World on the roadside (or sidewalk), and pedal past it at 16 miles per hour. You will then be able to relate to the speed of light, and appreciate how fast (or slow) it really travels in space.