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It seems like it wouldnt be hard to have the hazard lights start blinking if the airbags deploy.

I think the issue is that those lights are on the main power circuit, which shuts down if the user turns off the car.

That appears to be what happened here, I don't see running lights or anything. I think the person turned their truck off.

I honestly don't know if you're supposed to shut your car off after an accident to lower the fire risk, or leave it on to make the car more visible.

Two issues that come to mind are (1) keeping the lights on while otherwise shutting off the vehicle and (b) ensuring that the lights don't all get smashed to bits in the accident.

This is already present on many cars. After decelerating fast the alarm lights come on.

For instance:

https://www.volvocars.com/lb/support/manuals/s60/2015w46/sta...

You have to have at least one road flare in your car in Japan or it won’t pass inspection