The problem is that you get a very narrow field of view using a reasonably sized flat mirror at arms length. In order to have the same angle of view as all of our other mirrors, as well as the inside mirror of your car, (yes all of our mirrors have the same angle of view) your handlebar mirror would need to be 9 1/2 inches in diameter. We get the correct angle of view by making the Bar End Mirror convex. This solves the problem of angle of view but we end up with a smaller image. That is where you get the vehicles may be closer than they appear effect. But at least you see the traffic, other riders, etc..