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Analogue tachographs record the driver’s periods of duty on a waxed paper disc. However, these are vulnerable to tampering, and so are being replaced by digital tachographs which record data on smart cards.
== Use in
Before most carriers banned drivers from picking up hitchhikers in the UK many truck drivers would give hitchers the waxed paper recording disc or tacho. The hitchhiker would display the tacho when trying to get a lift as a sign that they were approved of by a previous truck driver.
Although it has become difficult to catch a lift from HGVs in the UK these days it is still possible and your chances improve with the older drivers if you have one of these discs. You may get a lift out of pure nostalgia or curiosity.