Flasher modules are available. I'm not aware of any regulation that would
prevent their use:
http://www.amazon.com/FLASHER-MODULE-MOTORCYCLE-SCOOTER-REARALERT/dp/B0036RFLR6
Many motorcyclists have found the value in flashing brake lights. Here is a
format that includes the flasher and bright LED lights. In this instance,
the light modules, which are waterproof, could be used to form the third
light and they would flash. The other two brake lights would behave
normally, unless a module such as above were used.
http://www.aerostich.com/catalogsearch/result/?q=brake+light+flasher
Regards,
Brian
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