I was thinking about what happened at Spa, with all those engines exploding in a few laps...
Maybe a good idea for the FIA, but when it's technically possible, wouldn't it be nice and usefull to light the rear light up when a problem occurs on a car. That way, at an explosion, other cars may see the problematic car sooner that before. I know you cannot see through 200 meters of smoke, but it might differ some 10m maybe, and since every meter is one useful for safety...

goods, bads?