as someone said - probably depends on the car and local. I know that during the NYC balckout, when I was using my personal truck to help with the Red Cross, I came back to my truck from the ERV and found 1/2 case of 30 minute road flares sitting in the bed - I guess the PD was replacing the ones I burned...

Of course one of THESE trucks could show up

http://www.extrication.com/esutrk.jpg