Why don't cars record speed and signal usage data for legal evidence?

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gfd43tg
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I think it would be great if cars software could historize data such as speed, using turn signals, etc which can be used in court to prove/disprove if someone was in fact speeding or didn’t use their turn signal. Why haven’t companies moved this way yet?
 
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Apart from turn signals, what makes you think they haven't?
 
Vanadium 50 said:
Apart from turn signals, what makes you think they haven't?
I’ve never heard of it. How can I access the data?
 
My mother in law has a dongle-like-thing in her car from an insurance company that tracks things like car speed.
If you don't speed, you get better insurance rates.
 
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BillTre said:
My mother in law has a dongle-like-thing in her car from an insurance company that tracks things like car speed.
If you don't speed, you get better insurance rates.
You beat me to it. Here is a link with more info: https://cars.usnews.com/cars-trucks/how-do-those-car-insurance-tracking-devices-work
 
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@BillTre and @berkeman, note that the data port is a way to access the data in real time via a stand alone device or bluetooth adapter, but I don't think you can access the car's actual black box that way.

...which isn't to say that wouldn't still meet the OP's needs.
 
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Maylis said:
The dash cam is in the works, but I want as much evidence at my disposal as possible
Research apps that can monitor the data in real time and record it. I'm not sure if a stand alone device exactly matching what you want exists though.

...edit: I've seen ones for parents to monitor kids though.
 
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russ_watters said:
Research apps that can monitor the data in real time and record it. I'm not sure if a stand alone device exactly matching what you want exists though.

...edit: I've seen ones for parents to monitor kids though.

It sounds like what I want is the OBD-2 device, but only I have access to the data