There is no possible way to prevent this because the other vehicles drivers are not under your control. You can take all the precautions you can and other drivers still do stupid things. I've been right hooked, left hooked, passed on the left while making left turns, passed on the right when making right turns. All of them I was making proper, obvious, legal gestures to indicate where I was going or intending to go. I hold my had flat at a right angle and even point at times and it still happens. Just watch like a hawk and never trust anyone.

A few weeks ago I was tooling up a wide street, saw a truck in my rear view mirror, moved towards the center of the street well before my left turn and sat bolt upright and held my left arm out straight and held it extra long, yet the truck decided for some reason to pass me on the left. Just as I dropped my arm to hold my bars to make the turn I hesitated a moment and stuck my hand out again, sure enough the truck flew past me on my left accelerating to what I feel was about 40 (in a 30 mph zone) and actually was close enough to brush my hand. Visibility was perfect. I was wearing hi viz stuff. I was in the middle of the center turn lane. I was indicating my intentions. There was no other traffic anywhere around. There was more than enough room to pass me on the right where he SHOULD of passed me. There was no way I could avoid almost being hit. I only avoided being struck more violently by being vigilant and extra cautious and paying heed to my doubts about other drivers. It's gonna happen so be careful out there.