maximus otter said:
What kind of emergency are you talking about?
I think your Wave would cover most car-related problems very well.
If you're talking about self-defence, do you really believe that your wife is capable of thrusting a blade into human meat? If you don't believe that 100%, then putting a combat knife in your car is an invitation to:
Theft by a criminal who won't mind sticking it into someone, or;
Adding a knife you won't use to the equation if you do ever get into a confrontation.
Stick with the Wave.
maximus otter
I may be wrong, but from what I gather, Maximus Otter, while not a bobby, really didn't go as armed as most Yank cops are. I like the guys posts, so I may be biased, but what he posted makes a lot of sense. My take on using knives as self defense weapons goes like this. Unless you are trained in self defense knife fighting, or you are agile and know something about street fighting, don't depend on a knife for self defense. Does that mean you shouldn't use it? Hell no, but you might get it taken away from you by someone who knows what they are doing.
As for a good car tool, just about any knife will do. I currently EDC a Leatherman Squirt, a Spyderco Ladybug, a SOG Blink and alternate between a Spyderco Delica and Native III. I also keep a Leatherman Juice in my truck. I keep the Juice and largest folder on my dashboard, within easy reach for whatever, whereever etc. I carry all these because I'm a knife nut.
My sister wanted a knife for her car, I think she saw one of the evening news shows do something on people getting trapped in their cars. I gave her an old Colonial barlow, re sharpened of course

, and she uses that, and has gotten good use out of it. I am going to give her a good tactical if she decides she wants it. She still thinks I'm a goofball for carrying all of those knives, but at least she has been converted. My mother is now interested in having a multi tool for her truck, and my father, while he really has no need for a multitool, and he already has a good edc, has been known to take a liking to my multitool from time to time. Even my little brother has hopped on the knife wagon.
I think a Leatherman Wave or SAK would be a good idea, along with a good lockback, linerlock or a fixed blade. Everybody has their favorite brands, I would champion for the folder either a Spyderco or Kershaw, they are my favorite users at the moment. For fixed, something smallish, maybe about a 4 to 5 inch blade, I am going to put either my old Western fixed or my Boker Arbolito fixed in my truck for that purpose.
Take your wife to a knife show, let her pick her own knife out, just make sure she doesn't get something like a UC that might break on her at any moment.