In Boston, driving is on the right and the minimum driving age is 16 years. The speed limit on most major highways is 88kph (55mph). On sections of the Massachusetts Turnpike (I-90), the speed limit is 104kph (65mph). Elsewhere, limits range from 32 to 80kph (20-50mph). It is possible to turn right at a red traffic light after stopping - unless otherwise indicated. Technically overtaking should only be done on the outside lane, although, in reality, cars on a five-lane highway regularly pass on both sides. At crossroads without traffic lights, the four-way stop system means that it is first-come first-served; the car to the right proceeds first.
While most non-US driving licences are acceptable, it is best to bring an International Driving Permit. The American Automobile Association (tel: 1 800 222 1134; www.aaa.com) can provide information, and may offer reciprocal benefits to members of automobile clubs in other countries.