Renting a car overseas can completely change a trip.

Instead of planning everything around train schedules or tour buses, you can drive through small towns, take the coastal road, stop somewhere because it looks interesting, and generally wander around a little.

But there's one document people tend to forget until they're standing at a rental counter: an International Driving Permit.

An IDP isn't a replacement for your driver's license. Think of it as a standardized document that accompanies your valid U.S. license and makes your driving credentials easier for authorities in another country to understand.

That distinction matters.

If you're doing any international driving, you generally need to carry your actual U.S. driver's license along with the permit. An IDP by itself doesn't suddenly give you driving privileges.

Do you need one everywhere?

No.

Some countries recognize a U.S. driver's license for visitors. Other destinations require or recognize an IDP, and a rental-car company may have its own documentation requirements as well.

The U.S. Department of State recommends checking the requirements before traveling and notes that many countries require an IDP in addition to a valid driver's license. AAA also maintains country information for travelers determining whether a permit is required or recognized.

An IDP can be particularly useful when you're renting a vehicle, driving across borders during a multi-country trip, or traveling somewhere that doesn't routinely deal with American driver's licenses.

There's another practical advantage: translation.

Your Ohio, Texas, California, or Florida driver's license makes perfect sense to someone back home. A police officer or rental employee thousands of miles away may not immediately understand every field or abbreviation on it. An International Driving Permit presents that information in a standardized multilingual format.

But don't confuse driving permission with insurance.

Having the correct license and permit doesn't mean your U.S. auto insurance automatically covers you overseas. The State Department specifically recommends checking your insurance coverage and the requirements of the country you're visiting. Rental-car insurance rules can also vary considerably.

And here's something else worth doing before departure: check the rules for every country where you'll actually drive.

Imagine flying into one country, renting a car, and taking a road trip through three others. The fact that the rental company handed you the keys in Country A doesn't automatically tell you what documentation Countries B and C require.

That's where planning your international driving paperwork alongside your passport and visas makes sense.

Texas Tower offers International Driving Permit services for eligible travelers with a valid U.S. driver's license. If you're planning to rent or operate a vehicle overseas, it's something worth handling before leaving the United States.

The IDP is one of those travel documents you may barely think about once you've got it.

But if you're standing at a rental counter overseas and someone asks for one, that's a pretty bad time to discover you should have gotten it before you left home.