Good question. I use nothing but my vocal chords. But a recent cyclist / pedestrian collision in our community has the unpleasant backlash of a 10 mph speed limit on all local trails / walking paths. I always take great care around pedestrians, especially when they have a dog on a leash which might cross my path. But when the path is free & clear, I like to pump it up! I love seeing folks using the trails and like using them myself as a break from dealing with traffic. I like to believe we can co-exist without too much fracas.
One thing I HAVE noticed, especially during the darker days or mornings, is that the flashing light on my helmet seems to gain attention from pedestrians ahead of me and they'll often glance back and step further to the side.
With all the mp3 players plugged in I'm not sure that we can get their attention via sound unless with a bull-horn loud device that may frighten them right into our lane.
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