This past Sunday i was passed by another cyclist while doing 22mph and I took a spill. This cyclist did not announce before they passed me. I honestly do not remember all the details, just them passing and then it's all blank. I ended up in the ER with a concussion. Some people from my group that where in the back said and that we bumped shoulders and i started swerving, then my handle bar went 90 degrees to the right and i went over it. The culprit of the accident claims that i was startled and i lost control. 

Regardless, passing another cyclist unannounced is one of the rudest and most stupid things you can do to a fellow cyclists. I can't even begin to count the number of times i have been passed by other cyclists announced. The last time i pointed it out to the guy that did it, we got into a fight. For all of you that pass others unannounced, stop doing it! It is flat out dangerous. People do not have eyes at the back of their heads and will not see you coming. We take a chance every time we go out against cars. Let's not have to worry about each other too.

Chryssa