Requirements
To rent a car, you must be at least 21 year old (age may vary by car category) and have held your license for 1 year. Drivers under the age of 25 may incur a young driver surcharge. Nearly all states have laws requiring the driver and front passengers to wear seat belts. Children up to age 5 must wear an age appropriate restraint.

The US highway system
Some of the major highways are toll roads often called turnpikes, but most are free. All major interstate highways running north to south have odd numbers and are ordered from I-5 on the Pacific coast to I-95 along the Atlantic coast. All interstates running east to west are evenly numbered beginning with I-8 and I-10 near the Mexican border to I-94 near Canada.

Speed Limits
Speed limits in the United States are set by each state or territory. Most usual daytime speed limits are as follows: City - 25-45 mph, Open Roads - 65-80 mph. The speed limit in front of every school is 15 mph when the warning lights are flashing.

Rules of the Road
When you drive in the USA, remember that each of the 50 states has its own set of traffic laws and regulations. Fortunately, most of the laws are the same, but some states have slightly different rules. When you rent a car, you should ask the agent if there are any special driving rules in that state.