I'd get a self-driving car if I didn't live in Fucking, Nowhere.
I'm transhumanist, but... idealistically so. I'd love a longer life, more direct control over what my body wants and does, that sort of thing, hell, I wouldn't mind something as stupid crazy as reinforcing my bones or rearranging my organs for better survivability, but I'd like the process of having it done be safe.
I'd be totally cool with replacing my legs, actually. Knees especially. I kind-of-sort-of have a "better foot" design concept I've always wanted to try (basically, you stand on a ball with six "toes" coming out in a hexagon shape, the "toes" are the main source of traction and can have various amounts of tension applied for climbing or just walking) that I came up with because I draw mecha all the damn time. We already have some crazy awesome prosthetics, and while this makes me sound like a body modder (i'm not... that much. Most I've ever actually considered this day and age is a tattoo, and not a prominent one either) I want mecha legs.
One of my knees is shit and probably always will be, as there's no real need or ability to undergo surgery, but it still acts up and moves way too much. I'd like to keep my fun bits, but aside from that, the waist down can go elsewhere. Unfortunately, there's a lot more human in the legs than just legs, and it's gotta go somewhere, and all those veins and the ilk aren't going to survive removal... so there's issues. Issues that I'd like to tackle.
Of all things I plan to be a game designer, but I've put serious thought to engineering and medical practices before (lack of drive is what stops me, mostly.) and the marriage of the two is something that I love the idea of and realize makes other people think I'm psychotic.
And maybe I am. I'm the guy who's talking about getting mechanized legs for no good reason other than a slightly off knee that still works fine. Let's say I woke up tomorrow with these things. I'd trip every metal detector from here to Kansas, have a very difficult time driving a normal vehicle, and my god, the logistics of it all; I'd be practically landlocked due to weight, and then there's upkeep...
So, maybe I'd want interchangeable legs. One's a carbon-fiber based model made to simulate the human leg, and then the model I envision is like... the hummer. Stupidly excessive in the best ways.
Something feasible that I want in my lifetime? Control switches. Link my stomach and my brain so that I can stop feeling hungry when I've clearly eaten enough. Imagine, even if I had to manually input data on the meal I just had/am having, the computers inside me would accurately tell my mind to sense fullness when I've got enough calories out of my meal. Perfect. I could set it to dieting, or for a period of high or low activity.
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On the cars...
What if you had a failsafe? Like, I realize, hackers could probably try to disable it somehow, but have myriad systems that start screaming "Something is wrong!" and transmit that like crazy to whatever's nearby. A crash happens. Other cars read the "Something is wrong!" signal, and can react? In addition to sensors?