Commute a lot? You’ll dig this. It’s in the “why the heck didn’t I think of that” category. It’s a car horn for a bicycle. Check it out here Bicycle Horn

It’s a tad bit pricey, about as much as a decent headlight system, but from the video, it seems to be effective. I wonder how it would play on the bike path 😉

Personally, I’m holding out  for the diesel truck horn…