A lot of modern vehicles automatically turn on there hazard lights when it detects a crash. Example (Skip to 2:00): Wouldn't it be cool if cars in-game can also do that? For example the modern Sunburst and ETK800. I have seen a mod for this before: http://www.beamng.com/threads/automatic-hazard-lights-on-accident-emergency-brakes.3692/
I don't think it does that at 2:00, because if you look closely, the lights are on already. Just saying But it would be cool, since whenever I try to make a huge crash, i've got to switch to every car on that highway that crashed... -_-