Example: I'm in San Francisco and am driving back to home to the peninsula and I want to have dinner on the way. I'm out of my area of knowledge, and there are probably tons of good restaurants that I'd like that are right on my way, but it takes too long to find them. Prohibitively long, in fact, because usually I just drive back home and eat somewhere near my house rather than hop back and forth between Yelp and the map on my phone for fifteen minutes.
Another example: I'm on a driving trip and I want to eat at one of the restaurant chains I like that's near the interstate. I'd happily wait 90 minutes if I could eat at a place I like, but I don't have any way of knowing whether something is coming. And searching for all the acceptable restaurants in all the upcoming towns isn't really reasonable.