Having used a Kisan Headlight Modulator for many years I can say this is one of the best safety devices besides a helmet and maybe ABS. According to the Hurt Report, a car turning left in front of you in an intersection is one of the most common 2 vehicle accidents involving a motorcycle.
A headlight modulator makes them see you, they almost can't miss you, 4 flashes a second is hard to miss. You can see how effective on the freeway when cars move out of your way and on surface streets when they don't inch out of driveways.
An headlight modulator combines with a LOUD horn and bright helmets and clothing have kept me out of trouble for many years.
Check it out.