The general rule for numbering on US freeways and interstates is that the odd numbers go north-south and the even numbers go east-west over their whole length, although at any single, localised point this may seem different. Driving in America is on the right and the speed limit is 48kph (30mph) in the city unless otherwise posted, 80kph (50mph) outside the city limits and 105kph (65mph) on freeways. Speed limits are clearly indicated along highways and are strictly enforced, with heavy fines imposed.

Driving visitors should note that it is illegal to pass a school bus with flashing red lights. It has stopped to unload its passengers and all vehicles must stop until the bus has moved back into the traffic stream. Turning right on red is not permitted in New York City. Seat belts must be worn (both front and rear) and drivers must carry their driving licence. Drink-driving laws are very strict and punishments severe. A blood alcohol level of 0.08% or above is illegal and drivers will be considered drunk and unable to drive.

The minimum driving age is 16 years. An International Driving Permit is recommended, although it is not legally required and a full national driving licence is accepted. All travellers intending to drive in the USA are strongly advised to acquire supplementary insurance. A yellow ‘non-resident, interstate liability insurance card', which acts as evidence of financial responsibility, is available through motor insurance agents.

The American Automobile Association - AAA (tel: (212) 468 2600) provides further information and roadside assistance to members.

Emergency breakdown service: AAA (tel: 1 800 222 4357).

Routes to the city: Travel to Manhattan from New Jersey, Philadelphia and Washington DC is across the George Washington Bridge or through the Lincoln or Holland Tunnels. The Verrazano-Narrows Bridge connects Brooklyn with Staten Island. Queensborough Bridge links Manhattan and Queens. The Triborough Bridge leads to upstate New York, while the New England Thruway and Bruckner Expressway lead to New England in Boston.

Approximate driving times to New York: From Philadelphia - 2 hours; Boston - 4 hours; Washington DC - 5 hours.

Coach services: The Port Authority Bus Terminal, 628 Eighth Avenue at 40th Street (tel: (212) 564 8484; website:  www.panynj.gov/CommutingTravel/bus/html/pa.html), handles long-distance and regional buses, as well as buses to the airports. Greyhound (tel: 1 800 231 2222; website: www.greyhound.com) operates bus services that link New York City to points throughout the USA and into Canada and Mexico. Direct services include Washington, DC, Chicago, New Orleans, Orlando and Montreal.