If you plan on driving a car, you’ll need to check out the local driving regulations.
You might need to obtain an international

r’s license or need special insurance.
If you are renting a car, check with the rental company to make sure you’ll meet the local requirements and be able to pick up the car. Some countries’ car rental companies have upper as well as lower age requirements.
You may have to pay a permit fee that allows you to

on their roads.
Road signage may be in unfamiliar languages and the colors and shapes of those signs may be different than those in the United States.
The direction of the lanes may be opposite of those in the United States.
Gasoline is usually considerably more expensive and is often sold by the liter, 3.78 liters=1 gallon.
Road conditions can be considerably more dangerous than those in the United States.
Some countries with modern highways allow much higher speeds than the law allows in the United States. Therefore, it is especially important to stay out of the fast lane, unless you are passing or willing to travel at these high rates of speed.