Chip and PIN systems can cause problems for travellers from countries that do not issue chip and PIN cards (most notably, the USA) as some retailers may refuse to accept their chipless cards.[8] While most terminals will still accept a magnetic strip card, and the major credit card brands require vendors to accept them, poorly trained staff may refuse to take the card under the mistaken belief that they will be held liable for any fraud if the card cannot verify a PIN. Non-chip-and-PIN cards may also not work in some unattended vending machines at, for example, transport stations.[9]
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http://en.wikipedia.org/wiki/Chip_and_PIN
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Foreign cards
Chip and PIN systems can cause problems for travellers from countries that do not issue chip and PIN cards (most notably, the USA) as some retailers may refuse to accept their chipless cards.[8] While most terminals will still accept a magnetic strip card, and the major credit card brands require vendors to accept them, poorly trained staff may refuse to take the card under the mistaken belief that they will be held liable for any fraud if the card cannot verify a PIN. Non-chip-and-PIN cards may also not work in some unattended vending machines at, for example, transport stations.[9]