Bicycles are so quiet, and we are so vulnerable, that defensive cycling is mandatory. I expect not to be heard, and probably not seen, and will still probably run into something or someone that didn't know I was there.
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FB4K - Every October we wrench on donated bikes. Every December, a few thousand kids get bikes for Christmas. For many, it is their first bike, ever. Every bike, new and used, was donated, built, cleaned and repaired. Check us out on FaceBook: FB4K.
Disclaimer: 99% of what I know about cycling I learned on BF. That would make, ummm, 1% experience. And a lot of posts.