A tachometer providing a record of engine speed over a period, especially in a commercial road vehicle.
- The retrieved tachograph had recorded a speed of 122 kilometres per hour at the time of the accident.
- This is a powerful indicator to their standing as commercials, and hence they will require a tachograph when towing a trailer for commercial purposes.
- Haulage drivers are already affected by tachographs on vehicles and there are quite tough restrictions for how long you can drive and leaving long rest periods.
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