Here's a different idea, and cheaper, if you have a windshield. Get a couple of 1 1/2" convex mirrors from an auto parts store. They make them self adhesive to stick to a regular car mirror. Stick them to the INSIDE of the shield, high enough for you to see the lights on the bars, (again, if you have the stock front signal setup). You can see the lights flashing in the little mirrors. It has worked for me.
