You need a Wolo air horn. I have one on my bike and it will definitely make cagers aware of your presence. It will also scare them. A guy who must not have seen me was about to cut me off when I gave him a good blast. I saw him physically tense up and get back in his lane; he probably thought he was about to get rear ended by an eighteen wheeler. I've seen them sold at Auto Zone and Walmart as well as Amazon.