i have always carried on. from back in the days when my 1960 falcon tended to burst into flame for no apparient reason.
has come in handy twice. once when a woman driving a van had a paint can burst and catch fire. i got her out and she only lost some skin on her arms.
second was a vette that crossed into opposing traffic on i-75.
he was pinned in and the car caught fire. we used three extenguishers to get one under control.
boy,, you should have seen his eyes when he saw those flames and knew he couldn't get out.