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The interstate highway system is extensive, well-signposted and well-maintained. Odd-numbered highways run north to south, while even-numbered highways run east to west. Many, but not all, highways or turnpikes are toll-free. Gas stations stay open late or 24 hours along main arteries. The average minimum driving age in the US is 16, but this limit is determined by individual states. Foreign drivers’ licenses are generally accepted in the US if they are in English; otherwise, it is best to get an international driver’s licence before your visit. All states have adopted .08 as the legal limit of blood alcohol content for drivers.
