I had one of these experiences when I was driving from Hungary to Austria. I was just blindly following the GPS, which started taking me down some very small roads with lots of turns. Since I had no idea where I was going I didn't question it.
I eventually stumbled upon a sign, in German, that was big and red, and I knew I was on the border between Hungary and Austria. I wasn't sure what the sign said, and at the time I didn't realize the two countries had an open border. I looked around for police like cars, and then quickly crossed the border, eventually reaching my destination just inside Austria.
As it turns out the sign just said "no vehicles over two metric tons", and that somehow I had gotten of the highway which had a very nice border crossing.
But a few years earlier and that mistake would have gotten me arrested!
Interesting that the sign was in German while you were on the Hungarian side.
I find GPS to be invaluable in countries where I can't even decipher their alphabet (Sanskrit, Chinese) and like you, I end up trusting them a lot more than I probably should!
I eventually stumbled upon a sign, in German, that was big and red, and I knew I was on the border between Hungary and Austria. I wasn't sure what the sign said, and at the time I didn't realize the two countries had an open border. I looked around for police like cars, and then quickly crossed the border, eventually reaching my destination just inside Austria.
As it turns out the sign just said "no vehicles over two metric tons", and that somehow I had gotten of the highway which had a very nice border crossing.
But a few years earlier and that mistake would have gotten me arrested!