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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 hitching [[hitchhiking]] ==
Before most carriers banned drivers from [[picking up hitchhikers ]] in the [[United Kingdom|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.