do not include a passport chip as they are issued by overseas posts that do not have the capability to produce ePassports. Because they are not a biometric travel document, travel on an these passport may require a visa, even where Australian citizens can usually travel visa-free. Australian citizens who cannot meet all requirements for an ordinary passport, but can satisfy the citizenship and identity requirements, or need to travel urgently and cannot wait for an ordinary passport. Issuance is strictly controlled, particularly where usual requirements cannot be met. They are valid for up to 12 months, though normally they are valid for 7 months. Special circumstance passports In limited circumstances, Australian citizens may be issued passports outside of the usual requirements. Such passports will always be issued in one of the above categories: ordinary, official or diplomatic. Other than for an emergency passport, their appearance is identical. Concurrent passport A concurrent passport is an additional passport issued to an individual who already holds a valid passport of the same category (ordinary, official or diplomatic). Issuance of these is very tightly controlled, and granted to enable travel in exceptional circumstances. Concurrent passports are most often granted when traveling (or transiting) a country that will not accept evidence of travel to certain places, or where significant delays will result in having to wait for the return of a passport following (unrelated) visa issuance. Other circumstances may be considered, requiring authorisation by more senior staff. These passports are valid for up to 3 years, except that an emergency passport is valid for up to 12 months. The validity period will usually be limited to the duration of travel needs plus 6 months. Limited validity passport These are issued to Australian citizens who cannot provide full documentation, provided their identity and citizenship have been confirmed. They are issued to applicants with incomplete or inconsistent documentation, to allow them to travel in the interim. They are identical to regular passports, but with shorter validity. They are valid for up to 12 months, and available from within Australia or London only. LVPs are most commonly offered to applicants with incomplete or inconsistent documentation around name or gender, such as following a name change. These applicants may hold cardinal documents, such as a birth certificate, differing from their current identity, without sufficient documentation to corroborate the difference. On completion of a full application and satisfaction of