It indicates the car speed.
See also:
Fiat Doblo Owner's Manual
h1 {color: red;}
h2 {color: green;}
h3 {color: blue;}
h4 {color: #FF00FF;}
...
Rear Head Restraints
To raise the head restraint, pull upward on the head restraint. To lower the
head restraint, press the push button, located at the base of the head restraint,
and push downward on the head restrai ...
Failure warnings
In case of parking sensor failure, the driver is warned when engaging reverse
by high sound warning (for 3 seconds). ...