It's a kind of pay-it-forward technology--do your best to reduce traffic in your wake, and ostensibly some driver in front of you is doing the same, helping everyone to flow along a bit more smoothly. Early test results showed that the system produces average speed increases of roughly 23 percent while trailing vehicles record an 8 percent fuel efficiency bump by not having to slow and accelerate as often since traffic doesn't back up. On-road testing is slated for May and July of this year in Japan and Indonesia, respectively.