The simply-named Oi, made by Australian cycling gear company Knog, is a bike bell for people who don't like bike bells. Such folks may be particularly keen on the latest model, the Oi Prima, as it's sleeker, slinkier and better-functioning than ever before.
Super long leashes are bad on trails, but at least they are leashed! We have a lot of entitled dog owners in the area who let their dogs offleash on busy mutli-use trails.
I had one guy, in complete darkness, have his large German Shepard off leash. I was riding my bike, and his dog came out of nowhere from the bushes to my right at full sprint, crossed in front of me to meet back up with his owner. I can’t imagine the disaster that would have resulted if I ended up colliding with his dog.