[Now I am thinking: brighter headlights? Modulator?]
This left-turn thing is my #1 nightmare. But, I've been riding with Skeen Designs Photon Blasters for the past 7 months and I'm sure they've alerted at least one or two drivers in a way even headlights won't. They're "strange" to oncoming drivers and seem to get noticed when headlights - all 3 of them - don't. Just sayin. Your experience with ATGATT is inspirational. Last summer my wife and I sweated through a week of 100+ days in the Balkans in full summer gear envying the locals in their t-shirts, shorts and flip-flops.... except that in Albania they don't post speed limits, you know where to slow down by the number of memorials erected for the dead along the roadway!
Thanks for posting!