Many flashlights have the "SOS" mode, in addition to fast flashing and solid. It is something like three long flashes, two short flashes each composed of 3 very fast flashes (or something like that--it's what seems to be on my flashlight). I find it a nice pattern because it's not so annoying as the fast flashing, and when it flashes it's on high, so very good for alerting pedestrians as I did today. Is it OK to use the SOS mode on a bike when there is no emergency? Likely no one pays attention to the pattern, especially since the bike is constantly moving instead of staying in the same place, but I just want to make sure it's acceptable.