I've seen this type of comment quite a lot here, and regardless of if you meant it that way I think it needs to be said for the benefit of all:
Bad road design does not excuse speeding.
Yes, changing the design is the more effective way to reduce the speed of traffic to a safe level. But just because the design was bad does not mean drivers can drive whatever feels right to them. The drivers still have a personal responsibility to drive safely, which in most cases means the same speed as the other vehicles, which means the speed limit bc that's the only one everyone can agree on.
If the road design tempts you to sin, cut off your engine.
I'm in the "inner monologue" camp. Most of what I think materialises as thought words. I don't have to move anything in my throat to do that unlike OP though, I can think in words without mumbling to myself.
But I know the voice can't be all. It's difficult for me to think in words while actively saying something, but I can have new thoughts while speaking. Sometimes, I get interrupted in thinking mid-sentence, but then I return to that sentence to finish it because... it's just satisfying? It's not that I learn anything new.
I feel like I don't have very much imagination any more. Its hard to produce images in my mind, not impossible but I do have to concentrate - remembering images is easier.
Weirdly, way harder to me: imagining a voice. Inner voice is what I sound like to myself, I can remember and replay songs and quotes as I heard them, but having any voice say anything is hard, especially female voices. Went through some examples in my head couldn't make anyone say anything - until I thought to make different tf2 mercs sing "Oh Canada", that somehow worked despite me definitely not having heard that before. Brains are weird.