Suppose that somebody asks me how to reach a place when I am at my cousin's. I don't live there, but I know the place enough to give indications. Suppose that I tell that person to follow the street he is on for half a mile, and then take another road in direction of a specific town.
I always used street to mean a public road in a city/town, but what should I use when I am not sure if the road is still in the town territory?
I imagine that if I say street and the person notices he is already outside the town, he would think he went too ahead, and missed the one I was talking of. If I say road when the road is still in the town territory, he could think he is supposed to go further ahead (and probably I was not precise when I said half of a mile).
Is there any way to avoid this kind of ambiguity, or isn't there any ambiguity at all?