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My point was that if deaf people get driving licenses we obviously don’t need the sounds anymore-———therefore JUST the lights.

That's not true because hearing people are not used to using their eyes like the Deaf are.

The thing that I've seen the Deaf do that absolutely amazes me is that they are focused on a conversation with the person across from them and someone sitting next to them is having a conversation with someone else, and the Deaf person will shoot a comment to the other conversation that he wasn't even watching.

They are far more aware visually of what is going on around them than hearing people. So flashing lights are enough for them that wouldn't be enough for hearing folks.

Not only that, Deaf is also a cultural thing. Many Deaf people have some level of hearing that enables them to hear sounds like sirens.