It's still instantly switching from brake to turn or reverse or whatever, just finishing a sequence before turning off - modern cars with sequential turn signals do this already.
In fact, I'd probably ONLY do it for the turn signal. Any other sequence can stop immediately.
As far as safety - While the cars I mostly work with are old enough to be exempt from DOT / safety regs (25 years I think), the factory lights on these cars are TERRIBLE generally. I've sold something like 40 sets of simple LED housings that are a fantastic upgrade and far safer, brighter.
I take safety into the highest consideration, the entire point of this project was to make them safer by not using any delays between change of function.
Anyway I hope that explains what I'm trying to do here a little better - There will be no delay in the brake lamps etc coming ON, just an "extension" of the function to finish a turn signal animation (which lasts half a second)