That makes sense. What tool do you use to do that? Is it something you generally do before you're going to pick someone up (before you get in the car) or do you also find ad-hoc reasons (in the middle of your drive) to do so?
Glympse Express does this well without much extra hassle. You put in a time limit and it gives you a link you can share. The link shows a map tracking you location (in a browser). No accounts or viewer apps required.
I've been looking for good apps to do this.