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Honestly, why doesn't your car automatically engage the turn signal after the wheel turns more than a certain number of degrees from center?
Because you're supposed to signal before you start turning, not when it's already obvious that you're turning.
Because then it would turn on when driving on a windy road
Well for one, it should turn on before your turn. Two, roads sometimes bend without an actual turn.
My city has started putting in a lot of these figure-8-shaped double roundabouts at overpass entries/exits. Automatic signals would be real fun there, it'd look like Christmas every day.
Some new MG cars do this, but it's super annoying because the tolerance level set by them is super low. It engages with the slightest turn, much lesser than a lane shift also, and it confuses drivers behind you. If you're taking a uturn, if you do a wider arch for a second, the guy behind you thinks you're going the other way and have suddenly changed your mind. While parking it's a nightmare as it keeps going on left and right every second. People behind me must think I'm an asshole. It's a good idea, but really badly implemented by them. But then again they're not really selling a car. They're selling a mid range android tablet with a car accessory attached.