Rabu, 26 Januari 2011


Tachographs are devices that record information about driving time, speed and distance. This information is used to monitor compliance with drivers’ hours rules.

There are two types of tachograph: analogue and digital. Analogue tachographs record the driver’s periods of duty on a wax-coated paper disc, while digital tachographs store the information on an electronic ’smart card’.

By law, all commercial vehicles first registered on or after 1 May 2006 must be fitted with digital tachographs. However, you can continue to operate an analogue tachograph in any vehicle registered before that date.

The main difference between analogue and digital tachographs is that digital tachographs use a smart card to record data instead of the round record sheets or charts used in analogue tachographs.

Analogue tachographs

The analogue tachograph records your driving information using three styluses that cut traces into a circular, wax-coated chart. They measure the:

• Speed of the vehicle
• Distance travelled by the vehicle
• Driver activity, also known as the ’mode’

The analogue tachograph also contains areas for manual entries, measuring activities such as:

•The entire daily working period
•Any rest periods
•Any work done outside the vehicle

Digital tachographs

Digital tachographs consist of two visible parts inside the vehicle - the vehicle unit (VU) and the speedometer. The VU receives a signal from a sender unit located in the vehicle’s gearbox. This signal is then sent from the VU to the speedometer unit where the driver can see it.

The VU is always set to Greenwich Mean Time (GMT). All records are set against this time.

The VU holds the system memory, including data about:

•All drivers of the vehicle and their periods of driving for about 12 months
•Any faults that have occurred
•Any attempts to tamper with the system
•Vehicle speeding
•Calibration details, when the tachograph is checked at an approved calibration centre
•When it has been accessed by control officers from the Vehicle and Operator Services Agency (VOSA) or the police
Smart cards

In addition to storing data on the VU, digital tachographs also store your driving and vehicle data separately on a plastic, credit card-sized card known as a smart card.

Four types of smart cards that can be used by digital tachographs:

•Driver cards - for drivers
•Company cards - for operators
•Workshop cards - for approved calibration centres only
•Control cards - for VOSA and police enforcement use only

A smart card is valid for five years. If it is lost, stolen or stops working during that period, a new card will be issued for the same validity period as the original.

Driver smart cards

By law, you must use a driver smart card if you are driving any vehicle under EU driver’s hours rules that is fitted with a digital tachograph.

You are only allowed to hold one driver smart card. You must never use someone else’s card, or allow another driver to use yours.

Sumber : www.ukdrivers.com

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