in my high school days, I kept a spring loaded center punch in my driver's door recessed door handle
Now, I keep a safety hammer on a velcro loop on my driver's door handle, and kept 3 in the limo.
I've seen videos of these spring loaded models that work well
I was the 3rd person to stop at an accident about 18 months ago...
Lady hit a tree on driver's side, she was alert and car was not smoking, so I took my triangle reflectors and placed them up the road (curve) and came back to her car.
When I got back, city police were just getting there. I watched the officer take his baton and hit her passenger at least 6 times to break it. Looked pretty radical!!!
he finally broke it, sending glass flying.
Someone had reached in from driver's BACK door and placed a towel over the lady, her driver's door was jammed against the tree.
I know the spring loaded glass breakers just shatter the glass, leaving it intact, then you push it out.
It just surprised me that an officer doesn't have a glass breaker/seatbelt cutter on his tool belt.