So the tail lights do not have to turn off when the turn signals flash. The amber lights merely have to be 9" center to center. Here's the thing about rear turn signals. They are not going to keep someone from hitting you. They tell the person behind you that you are going to turn. If they are the sort of driver to ignore your flashing yellow turn signal lens and try to occupy the same space as you, it will not matter if your signals are 3 feet apart. I have a BAF o-range helmet and people don't see me. Best thing to do is keep going a little bit faster than those around you, check to make sure that the other driver is not going to come up from behind you when you are changing lanes, assume that they will and prepare for that sort of thing. I use my signals, but assume that nobody cares becaues people just do not pay attention.
If you want to be super safe and have people see you, then do this:
And I assure you that everyone will see you. They may cause an accident staring, but they will see you.