3. An odometer or odograph is an
instrument that
indicates distance traveled by a
vehicle, such as a bicycle or
automobile. The device may be
electronic, mechanical, or a
combination of the two.
Most modern cars include a trip
meter (trip odometer). Unlike
the odometer, a trip meter is reset at
any point in a journey, making it
possible to record the distance
traveled in any particular journey or
part of a journey. It was
traditionally a purely mechanical
device but, in most modern vehicles,
it is now electronic. Luxury vehicles
often have multiple trip meters.
Most trip meters will show a
maximum value of 999.9. The trip
meter may be used to record the
distance traveled on each tank of
fuel, making it very easy to
accurately track the energy
efficiency of the vehicle.