Carefully, and on the right side of the road.Have copies of your friend's insurance and registration in the car.u00a0 It might also be a good idea to have a signed note from your friend that allows you to use the car.Try to get one of these before you leave the UK -An International Driving Permit (IDP) translates information contained on your driver's license into 10 languages so that officials in foreign countries are able to interpret your license. An IDP supplements a valid government-issued license--it does not serve as a replacement for a license. If you are stopped by law enforcement, you will most likely be asked to produce both your IDP and your official driver's license. The United States does NOT issue International Driving Permits to foreign visitors, so you will need to obtain this document before traveling to the U.S. http://www.usa.gov/Topics/Foreig... http://en.wikipedia.org/wiki/Int... Your friend will need to check their insurance to make sure it allows for this temporary use.*****People from the UK are generally regarded as competent drivers, and seldom get into difficulty.Except for ONE thing.They will go through a complex intersection, or enter a deserted road with no other cars in sight, and end up driving on the left side...