Hmmm....
Remind me why this is better than a .38 special? Pistol is faster, better 'distance', and certainly more lethal and intimidating.
Heck, I'm not even sure I know how to operate a road flare in time to get one off if someone jumped me! I wouldn't expect a non-defense oriented person to do it.
Imagine a woman with hairspray popping this off inches from her head in a struggle. Not pretty.
And of course there's always the thought of the lawsuit from the perp turned victim, when he claims he was there asking for directions when you disfigured him and melted his privates and face and hands off with a road flare...
Next up: How to use a cheese grater to ward off your attacker in the kitchen! HA!
Trying too hard to make a better mousetrap. Lead and gunpowder have been working wonders for centuries. Ain't much that trumps em, and certainly nothing a civilian can own.
No thanks.
Situational awareness goes a long way to avoiding this. The old saying is true: an ounce of prevention is worth a pound of cure. Drive around your spot before you park; park in well lit area; park facing OUT, not IN, for quick getaway; look before you open your door; etc.