I was on the interstate once, and there was a bike behind me that had the headlight on steady - but there were two smaller (but very bright ) lights on each side of the headlight that were alternating on/off.

It was irritating to have those lights in my rear view mirror for mile on end, and I finally slowed down and made him pass me.

The headlight modulators that pulse the headlight aren't nearly as offensive as those flashing lights - but I am not so sure how well they actually work at getting a distracted drivers attention.

If you want to find one to buy.....just to a search on "headlight modulators".

Just my opinion...

I don't think they are very effective. They're too regular. They go on, off, on, off, etc. Drivers don't see things that are regular. If they could somehow be made to pulse at different intervals then MAYBE it would be helpful. That's really the only way to get their attention.

On a side note, the other night I was riding by a church with my high beam on. A car stopped at the end of the church driveway waiting to pull out. I turned my high beam down to low so I wouldn't blind the driver. I was close enough to the car that there was no way she couldn't have seen me. You know where this is going! Yes, she pulled out in front of me. I don't think a modulating headlight would've helped in that situation.

ok cool thanks for that  
Next than what is I change a light to blue ?

I'm with Dave. Flashing the high beam to most drivers means "go ahead, i see you." I never flash at anyone. i use my horn and also sweep side to side in my lane so there is lateral movement of me and my headlight to catch the drivers attention. regardless, we are responsibe for our safety and always have to be prepared for someone pulling out at every driveway and every intersection. trust no one.

Kris01 wrote on 03/18/16 at 19:19:04:

Not clicking your high beam to low might have, as many drivers interpret ANY change of beam intensity as 'go ahead'
Not yourfault she was dumb, but just for future reference
I bought a day glo jacket and yellow helmet a few years back, to improve visibility
I had MORE near misses
switched back to black and guess what?
whod'a thunk basic biker black was a 'safety color' ?

I have a blinking headlight and back off LED brake lights.  I've ran them for a couple of years and about 12K.  I think they help. The headlight may not be "COOL" but it  helps people see me.  I know, I know nothing takes the place of good sense and tactics when riding.

Your Wife? Naaah,, ohh, yeah, that's it, suuure, the wife,, of COURSE..

Seriously, how much did you ride in your
They Gotta see me in This
jacket, before you went back to the Johnny Cash look?
That's weird, brighter colors and more drivers gunning for you.
Not only is that counter intuitive, it doesn't make sense, either.