I agree with those that suggest to take the lane. If you do not have a flashy rear light, I would add one. I have also worn a reflecting vest that has copy on the back that shows the legal passing distance in your state. If you can't finda vest with the legal distance, get the one that is close. Finally, I have had luck approaching the city or State, depending whose road it is, and getting them to install a bike caution sign. Your local advocacy group might be able to assist. The use of your videos will be a good tool. Also, a sign that displays legal passing distance is an additional alternative.