Interstate highways in the USA are designated by the letter ‘I' and a number. In addition to the interstates, there are state and local roads. The traffic drives on the right and overtaking should only be done on the inside lane, although 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 for right of way. At traffic lights, a right turn is permitted (with due care) on a red light, unless it is specifically stated not to do so. All drivers, front-seat passengers and children (under the age of 17) are required by law to use seat belts. It is illegal to pass a school bus (from either direction) if it has stopped and has its hazard lights flashing. The maximum legal alcohol to blood ratio for driving is 0.08%. The speed limit is 48kph (30mph), if there are no signs, although the general posted speed limit in town is 56-72kph (35-45mph) and 32kph (20mph) near a school. Freeway driving speeds are 88-113kph (55-70mph).

The legal driving age in Houston is 16 years. A valid driving licence in English or an International Driving Permit (IDP) is required - IDPs are not accepted unless accompanied by a valid driving licence. Third-party liability insurance is mandatory.

The American Automobile Association - AAA (tel: 1 800 222 1333; website: www.aaa-texas.com) can provide information and may offer reciprocal benefits to members of automobile clubs in other countries.

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

Routes to the city: Houston is encircled by Interstate I-610 - known as 'The Loop'. This is intersected by Interstate I-10, which links the city to San Antonio to the west and New Orleans to the east and also Interstate I-45 from Dallas to the north and Galveston to the south.

Coach services: Greyhound (tel: 1 800 752 2222; website: www.greyhound.com) operates regular services to San Antonio, Dallas and New Orleans. There are also Greyhound services to other major towns and cities in Texas and further afield.