Robert your question has made me think of my own situation.
I keep a Res-Q-Me on the steering column of both my work and personal vehicles, they are cheap and it just makes good sence to me. My knives and multi-tool are all located at the sides of my waist, not easy to access when sitting in the drivers seat.
On my work truck key-ring I have a red Fox 40 whistle, it is there to help me tell this key ring from my 3 others (work, personal, youth organization) and to add some colour to my keys in case I drop them in the bush/snow. In 7 years I have never used this whistle as a whistle, maybe I should replace it with a bright coloured Res-Q-Me for use on other vehicles when I am outside of my vehicle? I do carry a second whistle but it is sealed (therefore not as accessable) in my PSK. Thoughts?
Mike