Panzer campaigns: Speed in the unit info box.

[pax_xap]

The Speed of the unit in kilometers per hour is also listed. When the Speed is shown in Yellow, it indicates that this is a motorized or mechanized infantry unit that is currently on foot.

Depending on the Order of Battle information, certain units may be given a speed of 0. This
means they cannot move in the game. Typically, these units are artillery guns without available
transportation and are found in static defenses.  However, even though they cannot move and do
not have a Movement Point allocation, these units can still fire. In place of the Movement Point allocation field, the Fire Ability of these guns is displayed.

Thanks, but do you know what it really indicates ? 

The "kilometers per hour" term does not mean anything to me since this is a turn based game and not real time.