-whistle? (EDIT: whistle and siren are not legal to use in NYS or NJ)
-bell?
-horn?
-is there anything else?

i've used a bell since 2011 but that didn't prevent an oncoming cyclist from looking at the vista instead of the road then running right into me sending me flying last year.

i am getting the kickstarter fly12 (light/camera/alarm). i'm contemplating getting a GPS. i just want to protect myself on the road.

when i'm winded, i'm tired of continually shouting out to people to get their attention. i need something louder that i can dispense even when winded.

a nurse in the ER after my accident last year says he uses a whistle when he cycles to alert pedestrians meandering into the bike paths - i suppose thats loud enough for other cyclists and motorists.

what works for everyone? why do you use it? thanks for your feedback...