While some travelers report national licenses with English translations suffice, others have been explicitly asked for an IDP. It's advisable to carry an IDP to avoid potential issues with law enforcement, which could include detention or fines. The need for an IDP can vary by specific location and individual officer discretion. Australia, for instance, is a signatory to the Geneva Convention on Road Traffic, making an IDP officially necessary, although some car rental agencies may overlook this if national licenses are translated. Those with licenses from countries that signed the Vienna Convention may find their national licenses are sufficient in signatory countries.
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