A year and a half ago I was leaving on a ride and saw a guy on a cross street come to a complete stop at the stop sign, look both ways, and pull out when I was about 20 feet from him. I hit his car right behind the front wheel well. My Garmin's last reading was 18.2 mph. I pivoted on my front wheel and impacted the car with my right shoulder, re-breaking my right collarbone. My headlight was mounted but since it was 0800 and clear, I hadn't turned it on. Might he have noticed me had I had the light on the high-intensity blink setting? My guess is yes.

My current SOP is rear blinky always, front on high-intensity blink when in town or when visibility is less than perfect.