Speedometer
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A speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they started to be available as options in the early
A modern speedometer in a Toyota Corolla
A Ford speedometer, showing both mph (outer) and km/h (inner), as well as an odometer in miles
A digital, LCD speedometer in a Honda Insight
A speedometer showing mph and km/h along with an odometer and a separate "trip" odometer (both showing distance traveled in miles)
Odometer
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An odometer or odograph is an instrument used for measuring the distance traveled by a vehicle, such as a bicycle or car. The device may be electronic, mechanical, or a combination of the two. The nou
Speedometer
…of other purposes by the ECU or full-vehicle control system, e.g. triggering ABS or traction control, calculating average trip speed, or increment the odometer in place of it being turned directly by the speedometer cable. Another early form of electronic speedometer relies upon the interaction between a…
An electronic odometer with digital display (blue digits below the speedometer) showing 91,308 miles.
Reconstruction of Vitruvius' odometer, 1st century BC, Roma, Thessaloniki Science Center and Technology Museum
A reconstruction of Hero' odometer, 1st century AD, Alexandria, in Kotsanas Museum of Ancient Greek Technology, Athens, Greece.
A Han dynasty stone rubbing of a horse-drawn odometer cart