Is it possible to drill a hole on either end of the handle bars so the lights are facing outwards? The indicator lights could be wired inside the handlebar along with a small lithium-ion battery. There would be no compromise to the aerodynamics of the bike yet it would be on the outer most width as the most visible option. Im thinking along the same concept as those little side indicators on cars. Bar tape might be an issue with this. Why not on the top of the shifters? Shimano already have buttons on top of their Dura Ace Di2 shifters that are used with Garmin GPS Interfaces, so you could use those to indicate left or right. We should go into partnership. 60-40 lol