The 15% for either Rough or Open terrain is shown in the Combat panel that appears whenever you have your Armoured unit selected and are about to attack.
It appears in this panel as either: Rough Terrain Attack Bonus: X%
or Open Terrain Attack Bonus: X%
where the X% is a total of ALL bonuses for that terrain type.
So if you have the 1st promotion available to units that gives either 15% to either Rough or Open and later you have Lightning Warfare the bonus would a cumulative 30%.
The units also ignore the ZOC and gain an extra movement point as defined by the promotion.
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