Or you may be in a place where even if you do speak the language, and even if your CC (or other) policy covers you, you will end up on the wrong side of a debate with a local cop in a foreign country that you are unlikely to win.
Case in point: we went to Panama a year and a half ago, and the one trip prep detail I forgot about was to figure out whether our credit card covered insurance for foreign car rentals. (They did, as it turns out.) I didn’t want to try to figure it out at the rental counter in Boquete, so we just ended up buying the local insurance (which cost more than the actual car rental).
So in Boquete, a couple of times we ran into police roadblocks, when all the cop wanted to see was proof of insurance. Not even driver’s license, just proof of insurance. Now I am fluent in Spanish, but even if I’d remembered to print out the Visa car insurance documentation and had it with me, it would have all been in English. Did I want to spend a chunk of my vacation possibly being dragged down to the local police station to document my insurance coverage? Not so much.
(My co-worker with the Panamanian wife says the same thing happens to them regularly. They go every year. He lets her do the talking, but they still get the local rental car insurance.)
Spain requires it for Americans (whether rental agents do is a different question), but it’s because some of the most basic rules are different. NO turn on red whatsoever, for example. A three-point turn… in Spain would be known as “if a cop sees you, you’re getting proctologized with your own car”. In theory, getting an International Permit includes getting taught those things.
Huh. I got one in Chicago 10 years ago specifically to use in Spain. The process consisted of me paying $30 for someone to fill out a multilingual form with my driver’s license information on it. No traffic law instruction was involved.
The IDP is only a document with your domestic DL details on it and a photo. The convention (Geneva Convention on Road Traffic, 1949) establishing the IDP specifically allows use of your domestic DL in the contries that are signatories or have agreed to follow the terms of the treaty.
It does not require you to receive instruction on the rules in the countries you are visiting. If the rental agencies care, they will provide information booklets for overseas drivers. If they don’t care, you get nothing. That’s what I got in the US and Netherlands.