Garmin Varia is probably the most advanced "detection system" that has made it all the way to market. There's no lack solution for "visibility improvement" - after a dayglow jersey and lights, cyclists aren't hard to see. What you can interpret from the somewhat snarky answers above (normal around here) is that the biggest concern we have as cyclists is the automobile driver that is not doing their job. We know how to be seen, we know how to avoid trouble, we know how to manage maintenance and breakdowns. We just have little defense against stupidity. I know, doesn't help ya much...